千克是目前唯一一个以人工制品为参照标准的计量单位。
The kilogram is the only unit of measurement still based on a man-made artifact.
如果以宇宙时间为参照坐标(标准时间)，宇宙中任何一点产生的时间都是同时的。
If we set the universal time as a frame of reference standard time, time is simultaneous at every point in the universe.
建立以市场形成价格为参照的薪金标准。
Establishing a reference to the market price of the salary standards.
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