Bialternant
[数]双交替式
🗣️ 情景例句
Don't be upset, Malcolm.
别懊恼了 Malcolm。
No, I can't go to bed till she says Good night to me.
不，除非她向我道晚安，不然我睡不着。
Oh, yes, I can see them. But I can't reach them.
噢，是的，我能看见它们。但我够不着。