even if

even if
even if 即使
They couldn't, even if they would, get out of trouble by themselves.
即使他们想(摆脱), 也无法独立摆脱困难。
Even if I fail this time, I would try again.
即使我这次失败了，我还要再试试。
We should practice economy even if we are rich.
即使我们富裕了也仍应该厉行节约。
We'll go even if it rains.
即使下雨我们也要去。
Even if one graduated from college, he should still continue to learn.
即使大学毕业了他也要继续学习。

详解：

even if, even though 这两个短语都可作“即使,纵使”解,用来引导让步状语从句,一般可以换用。其细微差别是:
1.even if多用于口语中,而even though多用于书面语中。例如:
Even if you don't like wine, try a glass of this.
即使你不喜欢喝酒,也喝一杯试试。
They will stand by you even though you don't succeed.
纵然你不成功,他们也会支持你的。
2.even if引导的让步从句,所说的是一种假设兼让步; 而even though引导的让步从句所指的则是事实兼让步。试比较:
Even if he loves her, he can't marry her.
即使他爱她,他也不能和她结婚。
Even though he loves her, he can't marry her.
尽管他爱她,他也不能和她结婚。

either A or B<-->even though