屋顶上的风向标显示今天刮北风。

The ___vane on the roof shows the wind is blowing from the north today.

风向标上的叶片会根据风的方向转动。

The ___vanes on the weather vane rotate according to the wind direction.

老式箭矢的尾羽帮助它在飞行中保持稳定。

The ancient arrow's ___vane kept it steady in flight.