front shear line

基本解释

The major systems come from the shear line of low-layer, the low trough of upper air and the ground stationary front.
主要影響系統來自低層切變線、高空低槽和地麪靜止鋒；
The frontogenesis tilts the wet isentropic surface and produces significant positive vertical vorticity change in front of the frontal zone, which results in the fast development of shear line.
鋒生使得溼等熵麪傾斜，在鋒區前側産生顯著的正垂直渦度變化，切變線得到快速發展。
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The liquefaction front, originating from the envelope of initial effective stress points, gradually approaches the failure line as the cyclic mobility proceeds as a function of plastic shear work.
液化麪作爲累積剪切功的函數，從初始應力點的包絡線開始，隨著循環活動性的進行，逐漸接近破壞線。