我知道Anko提供了parseSingle、parseOpt和parseList函数，我不明白为什么AndroidDevelopers(书)的代码需要重新设计扩展parseList。你能告诉我吗？谢谢!https://github.com/antoniolg/Kotlin-for-Android-Developers/blob/master/app/src/main/java/com/antonioleiva/weatherapp/data/db/ForecastDb.ktoverridefunrequestForecastByZipCode(zipCode:Long,date:Lon