When Venus begins to cross the Sun's disc, it looks smeared not circular—which makes it difficult to establish timings.
当金星开始穿过太阳的圆盘时，它看起来有斑点，不是圆形的——这使得确定时间变得困难。
If it's square then it's not circular. And so on.
如果是方的，那么就不是圆的。
Time is not circular but linear.
时间不是循环的而是直线的。
Time is not circular but linear.
时间不是循环的而是直线的。
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