• 2) for, since, during for用于指“时间段”(a period of time), since用于指“时间点”(a point of time), during强调整个时间过程,与连词while有相 同含义。
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以for作介词,后面的时间标记是 一段时期 ( a period of time ),第二句的for three months即是已过了3个月时间 ,是3个月前至今的意思。
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over a period of time 在一定时期内 ; 在一段时间内 ; 一段时间内 ; 通过一段时间
After a period of time 经过一段时间 ; 一段时间过后 ; 一段时间以后 ; 一段时间后
Once a period of time 曾经一段时间
Within a period of time 一段时间内
during a period of time 某段时间内
Was a period of time 曾经一段时间
For a period of time 住一段时间 ; 一个时期
in a period of time 一段时间后
All these changes happened over a period of time.
所有这些变化都是在一段时间内发生的。
She spent a period of time working with people dying of cancer.
她用一段时间帮助即将死于癌症的人们。
After a period of time, the blanket breaks and a wet, weak butterfly appears.
过了一段时间,覆盖层破裂,一只湿漉漉、虚弱的蝴蝶便出现了。
And over a period of time her grades fell completely.
VOA: special.2010.04.22
There was a period of time in which, although there were decent, chess-playing programs couldn't beat the best chess-playing humans.
尽管曾一度出现过,强劲的象棋程序,无法战胜顶级人类棋手的情形
And it turns out that simply by counting the number of those spikes that occurs at a period of time.
随后,只要数一数在一定时间内,产生的尖峰脉冲的数量。
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