A high-speed, meandering wind current, generally moving from a westerly direction at speeds often exceeding 400 kilometers (250 miles) per hour at altitudes of 15 to 25 kilometers (10 to 15 miles).

• 急流：一种高速的、弯曲的风流，通常以超过每小时400公里(250英里）的速度从西刮来，高度达15至25公里(10至15英里）