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helicopters
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 upwards or downwards.
雅思英语词汇收录8785个雅思英语词条，基本涵盖了全部常用雅思英语词汇的翻译及释义，是英语学习的有利工具。