Air not only occupies space but it also has weight.
空气不仅占据空间，而且它还具有重量。
《新英汉大辞典》
2
As a method of spanning space, the arch can support greater weight than a horizontal beam.
作为一种跨越空间的方法，拱能够承受比水平梁更大的重量。
3
A new study found that inner-city kids living in neighborhoods with more green space gained about 13% less weight over a two-year period than kids living amid more concrete and fewer trees.