linch,车轴，pin,插销。引申词义中枢，关键。

1. Controlling wages is the linchpin of the Government'spolicies.

控制工资是政府政策的关键.

2. In the engine's producing, researching, using and repairing, engine - testing is the linchpin.

在发动机的生产研究和应用维修中, 发动机检测是其关键环节.

3. But the linchpin that network channel builds is letter platform build.

但网络渠道建设的关键是诚信平台的搭建.

4. He is the linchpin of this firm.

他是这个公司的灵魂人物.

5. Therefore, both are linchpin of society.

所以说理想和抱负是社会的一个重要部分.