upper air front [气象] 高空锋
The squall line is a kind of instable and strong convective weather caused by the air with upper-layer dry and lower-layer wet in front of the upper-troposphere trough.
分析指出，该飑线系统是由高空槽前型的上干下湿引起的不稳定强对流天气。
Stay seated; utilize a combination of the forks rebound, upper body strength and power on the cranks to loft the front of your bike in the air.
坐在车座上，把上身的力量集中在横把上，利用叉子回弹的合力使前轮离地。
The major systems come from the shear line of low-layer, the low trough of upper air and the ground stationary front.
主要影响系统来自低层切变线、高空低槽和地面静止锋；
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