call out for help; send out SOS signals

• 呼救

call out for help; send out SOS signals的用法和样例：

例句

1. The drowning child was crying out for help.
   溺水的孩子大声呼救。
2. Lucy's distress call was heard by the corvette.
   驱潜快艇听到了露西的呼救信号。