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Doctor Liu is on call at all times.
不论什么时候刘医生随叫随到。
《新英汉大辞典》
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Everyone needs a friend who you can call at the drop of a hat.
每个人都需要一个随叫随到的朋友，他会对你说：“嗨，我就来。”
youdao
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Everyone needs a friend who you can call at the drop of a hat.
每个人都需要一个随叫随到的朋友，他会对你说：“嗨，我就来。”
youdao