To be competent in his field, he must develop a working knowledge of this aspect.
为了使自己能胜任所从事工作，必须加深这方面知识。
Most adults do not feel competent to deal with a medical emergency involving a child.
大部分成年人不懂得如何对儿童实施急救。
He was a loyal, distinguished and very competent civil servant.
他是一位敬业、优秀而且非常称职的公务员。