For PTP multiple “private time zones” can be handled.
基于1个网页-相关网页
private time zones
私人时区
以上为机器翻译结果，长、整句建议使用 人工翻译 。
Thus the railroads established their own standardised times and the time that we now use, including the time zones (Mountain, Pacific etc), really comes from this entirely private sector need to deal with the new technology.
FORBES: How Technology Determines Time
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