Google Translation, how does the voice translation interface submit voice?

I want to call Google Translation api, in which the voice translation is very useful, I want to use it, but I can"t understand how the voice file is submitted to the background for translation, a lot of null when I take a look at api,.
play.google.com/log?format=json&hasfast=true&authuser=0

[[1,null,null,null,null,null,null,null,["zh-CN","chrome","71.0.3578.10"],null,[null,"10.0",3,null,null,2]],375,[["1540393094658",null,[],null,null,null,null,"[\"zh-CN\",null,null,null,null,null,null,null,null,null,null,null,null,\"\",null,\"en\",null,null,null,null,null,null,null,null,null,[],null,null,null,null,145,0,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,\"zh-CN\",null,\"Neha\",null,null,null,null,null,null,null,null,null,null,null,null,1,null,null,null,null,null,null,null,null,null,null,null,null,null,null,[]]",null,null,null,null,null,null,null,[null,[],null,"[[],[],[\"17259\",\"15700022\",\"15700124\",\"15700149\",\"15700186\",\"15700191\",\"15700201\",\"15700214\",\"15700230\"],[]]"],null,null,null,[],24,null,null,null,null,null,[]],["1540393095297",null,[],null,null,null,null,"[\"zh-CN\",null,null,null,null,null,null,null,null,null,null,null,null,\"\",null,\"en\",null,null,null,null,null,null,null,null,null,[],null,null,null,null,84,0,null,null,null,null,null,null,null,null,null,null,null,null,null,[1,2,\"zh-CN\",2],null,null,null,\"zh-CN\",null,\"Neha\",null,null,null,null,null,null,null,null,null,null,null,null,1,null,null,null,null,null,null,null,null,null,null,null,null,null,null,[]]",null,null,null,null,null,null,null,[null,[],null,"[[],[],[\"17259\",\"15700022\",\"15700124\",\"15700149\",\"15700186\",\"15700191\",\"15700201\",\"15700214\",\"15700230\"],[]]"],null,null,null,[],25,null,null,null,null,null,[]],["1540393095301",null,[],null,null,null,null,"[\"zh-CN\",null,null,null,null,null,null,null,null,null,null,null,null,\"\",null,\"en\",null,null,null,null,null,null,null,null,null,[],null,null,null,null,145,0,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,\"zh-CN\",null,\"Neha\",null,null,null,null,null,null,null,null,null,null,null,null,1,null,null,null,null,null,null,null,null,null,null,null,null,null,null,[]]",null,null,null,null,null,null,null,[null,[],null,"[[],[],[\"17259\",\"15700022\",\"15700124\",\"15700149\",\"15700186\",\"15700191\",\"15700201\",\"15700214\",\"15700230\"],[]]"],null,null,null,[],26,null,null,null,null,null,[]],["1540393095303",null,[],null,null,null,null,"[\"zh-CN\",null,null,null,null,null,null,null,null,null,null,null,null,\"\",null,\"zh-CN\",null,null,null,null,null,null,null,null,null,[],null,null,null,null,1,0,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,\"zh-CN\",null,\"Neha\",0,null,null,null,null,null,null,null,null,null,null,null,1,null,null,null,null,null,null,null,null,null,null,null,null,null,null,[]]",null,null,null,null,null,null,null,[null,[],null,"[[],[],[\"17259\",\"15700022\",\"15700124\",\"15700149\",\"15700186\",\"15700191\",\"15700201\",\"15700214\",\"15700230\"],[]]"],null,null,null,[],27,null,null,null,null,null,[]],["1540393102316",null,[],null,null,null,null,"[\"zh-CN\",null,null,null,null,null,null,null,null,null,null,null,null,\"\",null,\"zh-CN\",null,null,null,null,null,null,null,null,null,[],null,null,null,null,149,0,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,\"zh-CN\",null,\"Neha\",null,null,null,null,null,null,null,null,null,null,null,null,1,null,null,null,null,null,null,null,null,null,null,null,null,null,null,[]]",null,null,null,null,null,null,null,[null,[],null,"[[],[],[\"17259\",\"15700022\",\"15700124\",\"15700149\",\"15700186\",\"15700191\",\"15700201\",\"15700214\",\"15700230\"],[]]"],null,null,null,[],28,null,null,null,null,null,[]],["1540393102325",null,[],null,null,null,null,"[\"zh-CN\",null,null,null,null,null,null,null,null,null,null,null,null,\"\",null,\"zh-CN\",null,null,null,null,null,null,null,null,null,[],null,null,null,null,145,3,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,\"zh-CN\",null,\"Neha\",null,null,null,null,null,null,null,null,null,null,null,null,1,null,null,null,null,null,null,null,null,null,null,null,null,null,null,[]]",null,null,null,null,null,null,null,[null,[],null,"[[],[],[\"17259\",\"15700022\",\"15700124\",\"15700149\",\"15700186\",\"15700191\",\"15700201\",\"15700214\",\"15700230\"],[]]"],null,null,null,[],29,null,null,null,null,null,[]]],"1540393102536",[],null,null,null,null,null,null,null,null,0]:

there is also a return value that does not have the expected processing result: Hello.
but for subsequent requests, Chinese has already begun to be used: "Hello"

translate.google.cn/translate_a/single?client=t&sl=zh-CN&tl=zh-CN&hl=zh-CN&dt=at&dt=bd&dt=ex&dt=ld&dt=md&dt=qca&dt=rw&dt=rm&dt=ss&dt=t&ie=UTF-8&oe=UTF-8&otf=1&inputm=3&ssel=3&tsel=0&kc=3&tk=446069.18715&q=%E4%BD%A0%E5%A5%BD

% E4%BD%A0%E5%A5%BD means hello

response:

["-1",null,[[["ANDROID_BACKUP",0],["BATTERY_STATS",0],["SMART_SETUP",0],["TRON",0]],-3334737594024971225],[],{"175237375":[10000]}]

I guess it has something to do with the number 3334737594024971225.

ask the bosses.