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The captain found it necessary to send an SOS signal.
船长察觉到必须发出求救信号。
youdao
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When they are in danger at sea, they send out an "SOS" signal.
当他们在海上遇到危险时，就发出“SOS”的信号。
youdao
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When they are in danger at sea, they send out an "SOS" signal.
当他们在海上遇到危险时，就发出“SOS”的信号。
youdao