buoy|buoyed|buoys

游泳时，黄色浮标标出了安全区域的边界。

The yellow ___buoy marks the boundary of the safe swimming area.

救生圈使游泳者在水面上漂浮。

The life ring ___buoyed the swimmer in the water.

游泳区域由黄色浮标标示边界。

The swimming area is marked by yellow ___buoys.