If there were no force at the pin, g this object would be accelerated down with acceleration g, and that's not what's going to happen.
如果没有力的话，这个物体就会以加速度,往下掉，但是这,并没有发生。
Investigators scoured social networking sites such as Facebook and MySpace but initially could find no trace of him and were unable to pin down his location in Mexico.
调查人员搜寻了诸如Facebook和Myspace等社交网站，但一开始没有发现他的踪迹，也就无法确定他在墨西哥的具体藏身点。
At last we were able to pin the trouble down to a fault in the machine.
最后，我们终于找到了症结所在，是机器里面出了毛病。
The naval and air bombardments were designed to destroy the beach guns and obstacles, pin down the enemy and provide shelter for the ground troops on the open beaches by making craters.
舰炮和空中轰击的目的在于摧毁海滩上的火力网与障碍物，用火力把敌人困住，并在开阔的海滩上炸出弹坑，以此为地面部队提供掩体。
The naval and air bombardments were designed to destroy the beach guns and obstacles, pin down the enemy and provide shelter for the ground troops on the open beaches by making craters.
舰炮和空中轰击的目的在于摧毁海滩上的火力网与障碍物，用火力把敌人困住，并在开阔的海滩上炸出弹坑，以此为地面部队提供掩体。
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