On cloudy days or at night it was impossible to tell the time with a sun clock or a sundial.
在阴天或晚上，无法用太阳钟或日晷看出时间。
We all have a twelve o 'clock noon each day. Noon is the time the sun is highest in the sky.
每天都要一个正午十二点这样一个时间，正午是天空中太阳升的最高的时候。
They would begin to sing almost with as much precision as a clock, within five minutes of a particular time, referred to the setting of the sun, every evening.
准确得跟时钟一样，每天晚上，日落以后，一个特定时间的五分钟之内，它们一定开始歌唱。
They would begin to sing almost with as much precision as a clock, within five minutes of a particular time, referred to the setting of the sun, every evening.
准确得跟时钟一样，每天晚上，日落以后，一个特定时间的五分钟之内，它们一定开始歌唱。
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