These two characters are as if there is a wall between them, a wall of foam.

在这两者之间,就像是有一堵墙，一堵用泡沫筑成的墙。

耶鲁公开课 - 1945年后的美国小说课程节选

I tie a spring to my back and I anchor it to the wall and see how much the spring stretches before the two forces balance.

我把弹簧一端系在背后,另一端固定在墙上,观察两个力平衡时弹簧的伸长量

耶鲁公开课 - 基础物理课程节选