看看我这几句话的英语说法对不对

题目

看看我这几句话的英语说法对不对
1,这样的现象是如何发生的呢?
Why this phenomenor is occured?
2,这种行为是很难保持的（前文说保护环境的个人行为往往意味着个人自己付出不便）
Such a behavior is hard to preserve.
3,确实,环境保护是现代社会最严峻的问题之一,我们需要用每一份可以利用的力量来解决它.
Certainly,environment problem is one of most serious challenge in modern society,we need to solve it by every possible power we can get.

答案

1, 这样的现象是如何发生的呢?
Why did this phenomenor occure?
2, 这种行为是很难保持的（前文说保护环境的个人行为往往意味着个人自己付出不便）
Such behaviors are unsustainable.
3, 确实,环境保护是现代社会最严峻的问题之一,我们需要用每一份可以利用的力量来解决它.
Indeed, environment problem is one of most serious challenges in modern society, and we need to solve it with every possible resource.