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Time
時間
If you can read a clock, you can know the time of day.
如果你會看表，那你就能夠知道一天當中的時間。
But no one knows what time itself is.
但沒人知道時間是什么。
For all our success in measuring the smallest parts of time, time remains one of the great mysteries of the universe.
雖然人類能夠對時間進行精確的測量，但時間仍然是宇宙最大的奧秘之一。
One way to think about time is to imagine a world without time.
思考時間的一種時間是想象沒有時間存在的世界。
There could be no movement,
那就沒有運動，
because time and movement cannot be separated.
因為時間和運動密不可分。
A world without time could exist only as long as there were no changes, for time and change are linked.
沒有時間存在的世界，就沒有變化，因為時間與變化是相互關聯的。
We know that time has passed when something changes.
當事情發生改變時，我們知道時間已流逝。
In the real world with time, however, changes never stop.
在現實世界中，變化永不停止。
Some changes happen only once in a while, like an eclipse of the moon.
有些變化偶爾才有一次，如月食。
Others happen repeatedly, like the rising and setting of the sun.
有些變化則重復出現，如日出日落。
Huamns always have noted natural events that repeat themselves.
人類注意到自然現象的循環反復，
When people began to count such events, they began to measure time
也就開始進行計算，進而測量時間。
