前槽缘 anterior trough margin
超前掏槽 advance cut
前海槽 fore-trough
山前地槽 piedmont geosyncline
前方地槽 frontal geosyncline
前倾槽 [气象] forward-tilting trough
上牙槽前支 [解剖] anterior superior alveolar branches
前地槽构造层 pre-geosynclinal structural beds
前地槽 pregeosynclinal stage
上牙槽前动脉 [解剖] anterior superior alveolar arteries
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 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.
通过有限单元法计算和优化设计，确定锯片齿形前角、后角、楔角及槽底圆弧半径合理值的原则及其参考值。
Principles of reasonable values and reference data of saw tooth's rake, relief, wedge angles and radius of bottom arc can be determined through finite element method of calculation and optimum design.
仪器本体前侧上方水平安置荧光照明，浴槽视场清晰。
A fluorescent light positioned horizontally in the front-top of the bath.
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