1、It is important 或essential或crucial或significant for someone to do...对某人来说，做某事是重要的

　　例句：It is vital for human beings to take immediate action to protect wild animals.

　　2、be put under threat of 遭受某物的威胁

　　例句：Citizens are put under threat of getting infected with the virus.

　　市民正在遭受感染病毒的威胁。

　　3、The reason why...is that...原因是...

　　例句：The reason why fast food dominates our dining table is that governments fail to protect a nation’s traditional food industry.

　　快餐如今支配着我们的餐桌的原因是政府没有保护好本国的传统食品行业。