1)  touch the floor
着地
1.
In this paper,another way is used to prove that the chair stands steadily by moving a little,which is to use the angle between the legs of the chair and the pertinent diagonal to judge whether the legs of the chair touch the floor.
关于椅子能否在地面上放稳的问题,以前建模的方法是用椅子脚与地面的距离来度量椅脚是否着地。
2)  collision on the bed
着地碰撞
3)  surface vibration
着地振动
1.
Through con- trolling the time difference of collapse, the chimney was controlled to collapse on a collapsing workshop, the vi- bration test showed that the surface vibration caused by the chimney collapsed in such way is remarkably low- ered than that in ordinary way.
通过时差控制，使烟囱倒塌在尚未完全着地的厂房上，振动测试表明 １００ ｍ高烟囱的着地振动大大小于预计着地振动。
4)  jumping angle
着地脚
5)  parachute landing secure
着地安全
6)  landing angle
着地角
1.
The result shows that there exist great relation between landing angle and lose of horizontal speed.
结论 :着地角的大小直接影响重心移过支撑点即前支撑时间的长短 ,从而影响水平速度的损失率 ,也是影响每一跳水平、垂直速度分配的重要因
参考词条
补充资料：上不着天，下不着地
1.谓不着边际;没有着落。
说明：补充资料仅用于学习参考，请勿用于其它任何用途。