Outside, cool, dry, sinking air starts to wrap around the back of this mesocyclone, forming what's known as a rear flank downdraft.

外部那些又干又冷的下沉体开始在 “旋” 后侧环绕，形成一个 “后侧下环流”。

We planned for pennies falling through still air, but the helicopter creates a huge downdraft to support its weight.

我们原本计划让硬币在静止的，但直升机会产生巨大的下沉流来支撑其重量。

Continuing the vertical-take-off theme, the Jeep would have had 12 fans whose downdraft would have helped it over obstacles such as ditches.

继续刚才垂直起飞的主题，这辆吉普有12个螺旋桨，其产生的向下流能使吉普跨过壕沟等各种障碍。

797. Request offset 10 miles left to avoid the reported strong downdraft.

797. 请求向左偏移 10 英里，以避免报告的强烈下沉流。