This approach is fine provided the number of valid command line (long form) identifiers is small.
如果有效命令行（长形式）选项标识符的数量不大，这种方式很合适。
The best way to make sure that you supply a valid identifier is to enumerate the time zones available on your system and note the identifiers of the time zones present on them.
若要确保提供了有效的标识符，最好的方法是枚举系统上的可用时区，并记下表示每个时区的标识符。
The best way to make sure that you supply a valid identifier is to enumerate the time zones available on your system and note the identifiers of the time zones present on them.
若要确保提供了有效的标识符，最好的方法是枚举系统上的可用时区，并记下表示每个时区的标识符。
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