1、crack，英语单词，名词、动词、形容词，作名词时意为“ 裂缝；声变；噼啪声”，作动词时意为“使破裂；打开；变声；破裂；爆裂”，作形容词时意为“最好的；高明的”。

2、Plastic containers for juice and milk do not work as well because they tend to crack and leak more readily.装果汁和牛奶的塑料容器并不能达到同样好的效果，因为它们更容易破裂渗漏。

3、The seams must not crack or break on achieving this measurement and the neck must return to its original shape without sign of distortion.拉伸时不能为了达到尺寸导致拼缝破裂或爆口并且颈部必须恢复到原来的形状没有扭曲的迹象。