orthopteron

例句：

1. 1. The pilot skillfully guided the helicopter to land safely.
   飞行员熟练地将直升机安全降落。
2. 2. The military used helicopters to transport troops during the war.
   在战争中，军队使用直升机运送部队。
3. 3.He was so excited that he could hardly wait to take off in his new helicopter.
   他非常兴奋，迫不及待地想要驾驶他的新直升机起飞。