They have a good grip on the situation.

他们出色地控制住了局势。

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We lawyers may think we have a pretty good grip on the law, but the Bard of Avon is smarter than we are, and he has news for us.

我们法律人可能认为自己对法律有了很好的理解，但是莎翁比我们更明智，他有新消息告诉我们。

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If you are a keen tennis player then ensuring you have the right tennis equipment such as shoes that have ankle support and a good grip on the soles will prevent any ankle sprains.

BBC: Doctor's diary: Tennis fever