骨干

The older employees are the backbone of the industry.

富有经验雇员是行业干。

In 1998, some cadreman are admitted as shareholder.

1998年，公司将部分干吸收为股东。

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

只有那些坚干分子才不怕麻烦开。