There was a sharp rap on the door.

有人在重重地急促敲门。

《牛津词典》

Why didn't Dan want to rap on TV?

为什么丹不想在电视上表演说唱？

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"Perhaps it's not that hard to rap on TV," he thought.

他想：“也许在电视上表演说唱并不难。”

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"So instead of maybe doing a lecture on a scientific principle, we may learn a science song about it, or a rap or perform a dance that sort of uses our body to explain a scientific phenomenon.

VOA: standard.2009.11.25

The rap on converting to server-based has long been that it was big business complicated.

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The rap on this master southpaw was that he didn't consistently face top-notch opposition.

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"The normal rap on Baker is that he watches out for himself, " says a supporter.

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