unbreakable /ʌnˈbreɪkəbəl/

• 1. 

  ADJ Unbreakable objects cannot be broken, usually because they are made of a very strong material. 不会被打破的

  例：

  Tableware for outdoor use should ideally be unbreakable.

  户外使用的餐具最好是不容易被打破的。

• 2. 

  ADJ An unbreakable rule or limit must be obeyed. 必须遵守的

  例：

  One unbreakable rule in our school is that no child can be tested without written parental permission.

  我们学校必须遵守的规定是：没有家长的书面允许不能给孩子做测试。