rafter|rafters

雨滴从屋顶的椽子上滴落下来。

Raindrops were dripping from the ___rafter of the roof.

木筏正沿着平静的河流缓慢漂流。

The ___rafters are floating slowly down the calm river.

那位漂流者在下游遇到了湍急的水流。

The ___rafter encountered strong rapids downstream.