why is he sad的意思

他為什么傷心

that is to say───就是；即；換言之

as is the way───就這樣

white sand───白沙；白色沙灘；白砂

Then why are you singing so gaily? Usually when somebody loses something, he is sad.───那么，你為什么還這么高興地唱著歌呢？通常人們丟失了東西時總是很悲傷的。

This is the reason why he looks so sad today.───這是他今天看上去這么難過的原因。

Why is he always listening to sad love songs?───他為什么總是愛聽悲傷的情歌呢？