他没有经过专业培训英语

He must be professionally trained(接受过职业化的培训)He must be specially trained 也可以

The employees were not trained well enough. He didn't train the staff well enough.

I didn't pass the computer system is so training courses and professional.

In college, they didn't learn their major knowledge well / didn't do well in their major knowledge.In college, they didn't have a good command of their major knowledge.