each other 意为：互相，相互，彼此
例如，
We write to each other regularly.我们彼此经常通信。
They look at each other's faces.他们望着彼此的脸。
We see each other every now and again.
我们偶尔相见。
We help each other in our study.我们学习上互相帮助。
As friends,we should help each other .作为朋友,我们应该互相帮助.
