alternativa alternate 与alter三个单词的区别

alternative选择 adj. There was no alternative route open to her.
她别无选择。
n.If you don't like the school lunch, you have
the alternative of bringing your own.
要是你不喜欢学校准备的午餐,你可以自己带饭。
alternate交替的 adj
According to the weather forecast, there will be
a week of alternate rain and sunshine.
根据天气预报,下礼拜时雨时晴
间隔的
They saw each other on alternate Sundays.
他们每隔一个星期天相会一次。

vi.交替,轮流[(+with/between)]
For the next few days he alternated between
hope and fear.
其后几天中他时而满怀希望,时而充满恐惧。
alter vt.改变
Has she altered her mind?
她改变主意了吗?