Use a whistle if one is available.

可能的话，请使用哨子。

youdao

One whistle-blower he was referring to is Federal Agent John Dobson.

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One of the whistle blowers, Kirk McElhearn, said Apple had "done the right thing".

BBC: NEWS | Technology | Apple addresses iTunes concerns

BBC's Match of the Day 2 programme showed that, by the letter of the law, referee Martin Atkinson should have blown his whistle one second before Owen's winning goal.

BBC: Angry Hughes bemoans timekeeping