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气体开始在 “中气旋” 后，形成一个 “后下流”。

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，这有12个螺旋桨，其产生的向下气流能使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气流。