The helicopter is staying over our heads.
那架直升机就在我们头顶的上方。
A helicopter roared overhead and our son came in and told me he was scared.
一架直升飞机在头顶呼啸，我们的儿子跑进来并且告诉我他很害怕。
The studies of micro-unmanned helicopter in our country are at the beginning.
目前，国内对于微小型无人直升机的研究仍处在起步阶段。
A helicopter just landed in our schoolyard.
一架直升机刚刚降落在我们学校的操场上。
There is only a bus, five cars and a helicopter at our campus.
在我们的校园里有一辆小车，五辆公共汽车和一架直升飞机。
There is only a bus, five cars and a helicopter at our campus.
在我们的校园里有一辆小车，五辆公共汽车和一架直升飞机。
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