1·When you described depression as a "disease" you might have spelled the word with a hyphen.
当你形容为“疾病”你可能有一个连字符的拼写单词抑郁症。
2·Apply a default value, for example a hyphen (-), to make the attributes display that they are currently holding no value.
应用一个默认的值，例如一个连字符(-)，以显示当前没有任何值的属性。
3·A locale name is constructed from a two-letter lowercase ISO country code, optionally followed by an underscore or hyphen and a two-letter uppercase ISO language code.
语言环境名称是这样组成的：小写的两字母iso语言代码，可选地，后面可以跟下划线或连字符以及大写的两字母iso国家或地区代码。
4·You will also sometimes see a hyphen (-) used in place of a filename as an argument to a command, meaning the input should come from stdin rather than a file.
您有时会看到使用一个连字符(-)来代替文件名作为命令的参数，这意味着输入应当来自stdin而不是文件。
5·Many commands use a hyphen (-) in place of a filename as an argument to indicate when the input should come from stdin rather than a file.
许多命令使用连字符(-)取代文件名作为一个参数，用于表示输入来自stdin而不是文件。