frontal surface

and all system as a whole, icing of a frontal surface visually was not watched.

和所有系统作为一个整体，一个锋面结冰视觉没有看过。

Tangential frost-heave force is perpendicular to frozen frontal surface and is parallel to side surface of foundation which is a pulling force make foundation move as the frost heave deformation of soil.

其中切向冻胀力垂直于冻结锋面，平行作用于基础垂向侧表面，且通过影响基础与冻土间的冻结强度，使基础随着土体的冻胀变形而产生向上位移的拔起力。

the rain band advances and retreats closely related with the asia monsoon, and the frontal surface is between warm monsoon air mass and t.

梅雨雨带随季风的进退而进退，梅雨锋是季风气团和其他气团之间的锋面；梅雨锋区是位于夏季风北侧的相当位温强梯度带。