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英语翻译In Europe,before the introduction of the mechanical cloc

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英语翻译
In Europe,before the introduction of the mechanical clock,people told time by sun (using,for example,shadow sticks or sun dials) and water clocks.Sun clocks worked,of course,only on clear days; water clocks misbehaved when the temperature fell toward freezing,to say nothing of long-run drift as the result of sedimentation and clogging.Both these devices worked well in sunny climates; but in northern Europe the sun may be hidden by clouds for weeks at a time,while temperatures vary not only seasonally but from day to night.
其中这一句 to say nothing of long-run drift as the result of sedimentation and clogging.怎么翻译 漂流了怎么又沉积 阻塞了呢,还有 to say nothing of 这个词组放这里也翻译不通啊 +分
英语翻译In Europe,before the introduction of the mechanical cloc
这句的意思是说:“水时钟在温度降到冰点以下时就无法正常工作了,更不必说哪些由于泥沙的长期漂泊沉积下来并阻塞河道的情况了.