它们和以前一样具有约束力。

<em>They</em> are as binding as <em>they</em> used to be.

它们是棕色和黄色的。

<em>They</em> are brown and yellow.

它们必须是可计量的。

<em>They</em> need to be measurable.

它们是美国人建造的。

<em>They</em> were built by Americans.

它们必须耐得住磨损。

<em>They</em> must endure wear and tear.

它们有非常长的尾巴。

<em>They</em> have unusually long tails.

它们有很多相似之处。

<em>They</em> bear a lot of similarities.

它们的形状像珠宝盒。

<em>They</em> are shaped like jewel cases.

它们带来暴雨和洪水。

<em>They</em> bring heavy rain and floods.

它们受到建筑师的青睐。

<em>They</em> are favored by architects.