下降运动 meaning in Chinese

bathygenesis
descending motion

Most emergence or submergence does not remain strictly vertical .
大多数的上升或下降运动并非全然垂直。
Non - sinusoidal oscillation has the characters that the upward time of the continuous casting mold is longer than the downward time . it can reduce the friction between the mold wall and the strand surface , and prevents the strand from leaking and cracking , it can also improve the surface quality of slabs . it is the main development of continuous casting mold in the future
其中非正弦振动具有上升运动时间比下降运动时间长的特点，能减小结晶器与坯壳之间的摩擦力，防止坯壳的拉漏和拉裂，改善钢坯的表面质量，是今后连铸结晶器振动发展的主要方向。