Life became a struggle for survival.是什么意思？

Life became a struggle for survival.

生活成了一场奋力求生的斗争。

life

n. 生活，生计，生命，性命，一生，寿命，人生，尘世；

例句
In his later life he became even more absent-minded.
他晚年变得愈加健忘了。

became

v. 变为，成为（ become的过去式 ）；

例句
It became very clear that the incident was not just an aberration, it was not just a single incident.
事实已经很清楚，这件事不是偶发的，它并不是一起孤立的事件。

struggle

vi. 搏斗，奋斗，努力，争取；n. 打斗，竞争，奋斗；

例句
He praised her role in the struggle against apartheid.
他称赞了她在反种族隔离制的斗争中发挥的重要作用。

for

prep. 为，为了，倾向于，关于，当作；conj. 因为，由于；

例句
I've come looking for a bit of advice.
我特来讨教。

survival

n. 幸存，生存，幸存者，遗物，遗风；

例句
For the first time since creation, the survival of the Earth is entirely in our hands.
自宇宙形成以来，地球的存亡第一次完全掌握在我们手中。