267. It is essential that... 有必要……
It is essential that we protect our environment.
我们有必要保护我们的环境。
It is essential that our country trade with other countries.
我们国家与其他国家进行贸易往来是有必要的。
It is essential that we send the victim to the hospital immediately.
我们有必要马上送受害者去医院。
