She was very upset at what to him was just a throwaway remark.

对他来说这只是随口说说而已，而她听了却很不高兴。

A prototype is really a partially built program, not a throwaway.

实际上，原型是一个被部分构建的程序，而不是在测试之后即被丢弃的废品。

A throwaway forum account with a weak password might be exploited years later, and could even be a password you still use with active accounts.

一个使用弱密码的废弃论坛账户可能会在几年之后被破解，但是他的密码你可能在其他账户中还在使用。