When an ionic crystal dissolves in a solvent, the ions break off from the crystal . 当离子晶体溶解于溶剂时，离子由晶体脱落。
The front and side walls were bucked inward several inches, and the door in the front was broken off . 屋前以及两侧墙壁向内凹进数寸，前门被刮掉。
Washington did not finally break off diplomatic relations with cuba until january 3, 1961 . 直到一九六一年一月三日，华盛顿才最后同古巴断绝了外交关系。
They've always been bound to each other; they remained so even after she broke off or he did . 他们始终勾结在一起，甚至在她或者他改邪归正以后，还是这样。
Peter had one eye on the suite doors, ready to break off the conversation the moment they opened . 彼得一支眼睛盯着套房的门，准备等门一开，他就可中断谈话。
I used to think that little pieces of my heart were breaking off while i watched noah destroy himself . 眼看着诺亚在毁掉自己，我曾想，我的心也随之一块块破碎。
When a rock is heated by the sun, its surface expands more than its interior, and a layer may break off . 岩石受到日晒时，其表面比内部更为膨胀，就可能引起岩层破裂。
Vandalizing the great buildings, tearing up fences, breaking off the branches of small tress, smashing windows were their way of showing their anger . 破坏大建筑物、拆毁篱笆、折断小树的枝杈、打破窗玻璃等就成为他们泄愤的方式。
In 1962, the general assembly deplored the failure of south africa to comply with the repeated requests and demands of the assembly and the security council, and asked member states to break off diplomatic relations with south africa, boycott south africa goods . 一九六二年联大大会对南非没有遵守大会和安理会多次提出的呼吁和要求表示遗憾，并且要求各会员国与南非断绝外交关系，抵制南非货物。
