单词：helos
helo的用法和样例：
例句
- I can only say in 3rd generation helo design, we have control of enough design technology.只能说，我国在第三代直升机的设计上，已经掌握了相关的设计技术。
- The worst thing that can happen to a helo, aside from outright being destroyed, is for it to have an engine failure.对于直升机来说，除直接摧毁外最坏的情况就是发动机失效。
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