从你上封信看，你一定度过了一段精彩的时光。
Judging by your last letter, you must have a very wonderful time.
过一段时间后他们一定很冷。
他取得了一定程度上的成功，给年轻的殖民地带来了一段和平的时光。
He was to some extent successful, and the young colony enjoyed an interval of peace.
但是是不是一定可能开始一段友谊呢？
在很长的一段时间内，人们对上述流态的了解仅限于定常的或时间平均的流态。
However only steady and mean flow state have been studied for a long period of time.
扩压段应具有一定的长度以保证主气流减速到一定程度。 。
Thee diffuser length should be long enough to ensure the main flow deceleration.
分析与实验表明，这种方案在一定的运行频率段是行之有效的。
The theoretical analysis and experiment show this new scheme is effect at certain frequency range.
指某段历史或是某人生活中具有一定特征的阶段。
疼痛与否也不一定，一般都是试验性治疗一段时间后才诊断。
Pain is not necessarily are generally experimental treatment for a period of time after diagnosis.
大家已经在FTD上训练了一段时间了，都应该具有了一定的经验。
We have been enough time on the FTD and get some experience.
但我想你一定受了惊吓，需要休息一段时间。
I believe you must be shocked and need to have a good rest for recovery.
走了好长一段路后，你一定感到累了。
迈克：我还是不能相信人们能一直呆在水里。过一段时间后他们一定很冷。
Mike: I still can't believe people spend all that time in the water.
迈克：我还是不能相信人们能一直呆在水里。过一段时间后他们一定很冷。
Mike: I still can't believe people spend all that time in the water.
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