upper trough soaking 上槽浸渍
upper trough or low 高空槽或低压
Two eastward shift of upper-trough 两次高空槽
upper-level trough [气象] 高空槽
tropical upper-tropospheric trough 热带对流层上部槽
upper-air trough 高空槽
Upper air trough 高空槽
In high level. upper trough on South Asia High and its north and release of potential heat made it maintained,therefore divergence at upper layer was enhanced ,and high jet was built.
东北部的冷空气向西南运动生成和加强了低层南北向锋区；高层，南亚高压以及其北部的高空槽和潜热释放的反馈使南亚高压维持，从而加强了高层辐散及中尺度高空急流形成。
参考来源 - 台风与中纬度系统相互作用对华北暴雨贡献的中尺度研究·2,447,543篇论文数据，部分数据来源于NoteExpress
The results show that upper trough and shear line and thermal depression are main synoptic systems introducing summer sand-dust storm.
研究发现高空小槽、切变线、热低压是引发夏季沙尘暴的主要天气系统。
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。
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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