短语
中文翻译：随叫随到
同义词：
['call at', 'come when called', 'be on call']
例句：
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1. She is always at the ready to help anyone in need.
她总是随时准备帮助需要帮助的人。
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2. The police are on call 24/7 for emergencies.
警察随时待命，24小时应对紧急情况。
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3. The doctor was called to the scene immediately after the accident.
事故发生后，医生立即被叫到了现场。