shoulder前用什麼介詞

前用介詞on，例如：

1、Here it becomes very important to keep our head on shoulder.此時，保持頭腦清醒時非常重要的。

2、He felt a tap on his shoulder and turned round.他覺得有人輕輕拍他的肩膀便轉過身來。

3、The gentle touch of his hand on her shoulder made her jump.他的手輕輕地觸了一下她肩膀便使她跳了起來。