entail基本含义
使(某事物成为)必要;需要
v. 使必需,使蒙受
第三人称单数：entails
现在分词：entailing
过去式：entailed
过去分词：entailed
This job entails a lot of hard work.
这项工作需要十分努力.
That will entail an early start tomorrow morning.
那就需要明晨很早动身.
Such a decision would entail a huge political risk
这样的决定势必带来巨大的政治风险。
need基本含义
此词意指需要某种绝对不可缺少的东西，或者用于表示强烈愿望，或用于夸张，较非正式。
n.需要,必须,缺乏
v.需要,必需
conj.需要
第三人称单数：needs
复数：needs
现在分词：needing
过去式：needed
过去分词：needed
He desperately needed money
他迫切需要钱。
The doctor told me i was in need of a good rest.
医生对我说，我需要好好休息。
I feel a need to talk to you about it.
我觉得有必要跟你谈谈那件事。