the expansion and contraction of the metal金属的膨胀与收缩Contraction of the timbers left gaps in the fence.木料收缩,结果围墙露出缝来.The forces of expansion are balanced by forces of contraction.扩张力和收缩力相互平衡....
他对那件茄克衫简直喜欢极了.He just flipped over that jacket.不知你们是否有企鹅牌茄克衫?I wonder if you stock any Penguin Jacket?他穿了一件肘部打着各种补钉的茄克衫.He wears a jacket of sorts with patches at the elbows....