使用WechatSI 同生传译 返回的result 是空的

{tempFilePath: "http://tmp/Ll4H0sAd6T4Fe2eacbbdefc6c3d37dbf1f61333a5e99.durationTime=2106.mp3", result: "", duration: 2106, fileSize: 18052}
duration: 2106
fileSize: 18052
result: ""
tempFilePath: "http://tmp/Ll4H0sAd6T4Fe2eacbbdefc6c3d37dbf1f61333a5e99.durationTime=2106.mp3"
hasOwnProperty: (...)
isPrototypeOf: (...)
propertyIsEnumerable: (...)
toLocaleString: (...)
toString: (...)
valueOf: (...)
defineGetter: (...)
defineSetter: (...)
lookupGetter: (...)
lookupSetter: (...)
proto: Object