必须对操作工进行知识和技能的培训，经考核合格持证上岗。
To improve knowledge and skills, the operators must be provided with necessary training.
必须对操作工进行知识和技能的培训，经考核合格持证上岗。
To improve knowledge and skills, the operators must be provided with necessary training. Only those holding qualification certificates are allowed to work on relevant posts.
交通警察经考核不合格的，不得上岗执行职务。
Any traffic policeman who is assessed to be unqualified shall not be on post to perform his duties.
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