相依为命的英文：
depend on each other for survival

参考例句：

The grandfather dies, and the mother is alone with joey
外公去世了，撇下妈妈跟乔艾相依为命。

After all, they were bound to each other
不管好歹，他们毕竟还是相依为命的。

The mother and daughter shared their life together, supporting each other through years of hardship.
母女俩相依为命度过了苦难的岁月。

So the poor kept each other alive in the depression years.
穷人们就是这样在大萧条的岁月里相依为命的

No matter what the world does to us, we belong to each other
无论别人怎样对待我们，我们都相依为命。

depend是什么意思：
v. 取决于；依赖，依靠；相信，信赖

This is a dependent territory.
这是片属地。

It depends on the weather.
这取决于天气。

It depends on circumstances.
这要视情况而定。

each是什么意思：
pron. 每个；各自
adj. 每个的；各自的
adv. 每个；各自

To make each day count.
让每天活的有意义。

These chairs cost 40 each.
这些椅子每把价钱为40英镑。

elongation for each pass
每道次延伸量

survival是什么意思：
n. 幸存，残存；残存物；幸存者

Few survived after the flood.
洪水后极少有人生还。

These are the survivals from the primitive society.
这些是原始社会的遗物。

Britain survives free.
自由在英国得以幸存。