helicopters
柯林斯词典
1. N-COUNT A helicopter is an aircraft with long blades on top that go around very fast. It is able to stay still in the air and to move straight upward or downward. 直升机
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1. N-COUNT A helicopter is an aircraft with long blades on top that go around very fast. It is able to stay still in the air and to move straight upward or downward. 直升机