动词短语
中文翻译：大声呼救
同义词：
['call for help', 'plead for help', 'beg for help']
例句：
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1. In the middleof the night, I heard a loud shout for help.
半夜里，我听到一声大声的呼救。
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2. The injured person was shouting for help as he fell from the tree.
受伤的人在从树上摔下来时大声呼救。
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3.The police were shouting for help when they received the distress signal.
警察在收到求救信号时大声呼救。