fly low

例句：

1. 1.The bird flew low over the treetops.
   那只鸟低飞过树梢。
2. 2. She swam underwater to escape the shark.
   她潜入水下以逃避鲨鱼。
3. 3. The plane hovered above the clouds before landing.
   飞机在云层上方盘旋后降落。