对检验流程、存储外观，甚至特殊的目录信息的显示都有不同的需求。
There are different requirements for checkout flow, store look-and-feel, or display of the catalog information.
为提供安全性，一些网站要求用户密码必须混合使用字母，数字甚至特殊字符。
To improve security, some Web sites are forcing users to mix letters, numbers and even symbols in their passwords.
探险家们甚至需要戴上特殊的面具来保护自己不受洞穴里气体的伤害。
Explorers even need to wear special masks to protect themselves from the gases in these caves.
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