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1·What lies at the root of his troubles is a sense of insecurity.

他的一切忧虑源于一种不安全感。《牛津词典》

2·Emitting too much greenhouse gases such as carbon dioxide lies at the root of global warming.

排放过多温室气体，如二氧化碳，是全球变暖的根本原因。

3·Jet nozzle is arranged at the root of the fairwater.

喷流孔布置在导流帽的根部。

4·Social exclusion is often at the root of the problem.

社会排斥往往是问题的根源。

5·This is at the root of why Boeing has yet to make a decision.

这也是波音举棋不定的根本原因。

6·Japan's shrinking population is at the root of both phenomena.

日本人口下降是两种现象的根源。

7·A sense of overwhelm is often at the root of our work problems.

被工作压倒的感觉常常来自于工作中根本的问题。

8·The path is a relative path starting at the root of the plug-in.

这个路径是一个开始于插件根目录的相关路径。

9·In fact, those ten years may be at the root of the Doha impasse.

事实上，这十年是形成多哈僵局的根源。

10·A fort is a stronghold and that's what's at the root of comfortable.

fort是堡垒的意思，也是comfortable的词根。