Lenore answered, "It is as big as the nail on my finger.

VOA: special.2009.03.28

But you can nail it to the wall and pull one end.

你可以将它钉在墙上,拉着它的一端

耶鲁公开课 - 基础物理课程节选

But you can nail it to the wall and pull one end.

你可以将它钉在墙上,拉着它的一端

耶鲁公开课 - 基础物理课程节选