1.Other birds flying in the upwash experience reduced drag, and spend less energy propelling themselves.

其他经历上洗流会受到变弱阻力，样在推动自身向前过程中能够消耗较少能量。

2.The air flowing over a bird's wings curls upwards behind the wingtips, a phenomenon known as upwash.

翼上方气流在翼尖后方向上盘旋，种现象被称作气流上洗。