骨干

The older employees are the backbone of the industry.

富有经验的雇员是行业的骨干。

In 1998, some cadreman are admitted as shareholder.

1998年，公司将部分骨干吸收为股东。

It’s only really the hard core that bother(s) to go to meetings regularly.

只有坚定的骨干分子才不怕麻烦定期去开。