Windshear is a sustained change i . e . lasting more than a few seconds in headwind or tailwind resulting in changes in the lift to the aircraft 风切变是指逆风或顺风出现持续的转变持续至少数秒钟而引致飞机的浮力产生变化。
An aircraft flying across this region would have experienced severe windshear reaching 22 m s , or about 43 kts loss or gain in headwind 如飞机横过这区域将会受到强度达22米秒的猛烈风切变，即逆风增加或减少约43海里小时。
Indeed , an aircraft landing at the airport near midday that day reported encounter of a headwind loss followed by a headwind gain 这样相等于逆风减少。事实上，当日中午一班降落的航机正好首先遇到逆风减少，然后逆风增加。这与
Windshear is a sustained change ( i . e . lasting more than a few seconds ) in headwind or tailwind resulting in changes in the lift to the aircraft 风切变是指逆风或顺风出现持续的转变（持续至少数秒钟）而引致飞机的浮力产生变化。
Under normal circumstances , an aircraft that comes in with the sea breeze will experience a headwind gain when crossing the leading edge of the sea breeze 是展示海风结构的示意图。在一般情况下，飞机进场时飞越海风的前缘会遇到逆风增加。
In that sense , the dollar has already achieved most price targets based on breaks of technical levels and will likely face stronger technical headwinds in the week ahead 从这个意义上说，美元已经达到各个目标价位，未来几周将面临严峻阻力。
Under normal circumstances , an aircraft that comes in with the sea breeze will experience a headwind gain when crossing the leading edge of the sea breeze 是展示海风结构的示意图。在一般情况下，飞机进场时飞越海风的前缘会遇到逆风增加。
However , if within the sea breeze the tailwind is increasing from point a to point b instead of decreasing then it translates into a headwind loss for the aircraft 然而，若果在海风当中是顺风增加由a点至b点而非减少时，则飞机亦等同遇到逆风减少。
