Such changes are all but invisible over the short time scale of modern observations, and, it is argued, they are usually obscured by innumerable gaps in the imperfect fossil record.
这些变化在现代观测短时间范围内几乎是看不见的，而且，有人认为，这些变化常常被不完善的化石记录中的无数空白所掩盖。
It is a curious fact that in bad days we can very vividly recall the good time that is now no more; but that in good days we have only a very cold and imperfect memory of the bad.
一个奇怪的事实是，在失意的日子里，我们能够生动地想起不复存在的美好时光；而在得意的时候，对苦难的日子却只留有非常淡漠而残缺的记忆。
Although imperfect, these central bank actions have been helpful in moderating the severity of economic cycles over time.
尽管这些央行的行为不尽完美，总的来说它们确实有助于缓解经济周期的严重性。
People in the world are facing the imperfect information all the time, so do the suppliers and the demanders in education.
现实世界人们时刻面临不完全信息，同样教育领域的供需主体也时刻面临不完全信息。
When the distribution of life, delayed repair and imperfect repair time are all exponential, Markov renewal process for educing the availability is presented.
并在寿命、修理延迟和维修时间均服从指数分布的情况下，用马尔可夫更新过程理论导出了系统的可用度。
Often, when we feel we don't have the time, energy or resources, it seems better to put off taking action or to take no action at all rather than risk being imperfect.
往往，当我们感觉没有时间，能力或者资源，似乎将行动拖延或毫无行动就成了要比冒险不完美要更好。
When I suggest any of these activities to Anton he looks terribly disappointed in me, as if discovering for the first time that his father is imperfect after all.
当我向安顿推荐这些活动的时候，他看上去对我失望极了，就好像他刚刚发现原来他的父亲也不是无所不能的。
He looks as if he is discovering for the first time that his father is imperfect.
他看上去就好像第一次发现原来他的父亲不是无所不能的。
News that was scheduled on the line 20 "Jingdong buy" back-channel systems are imperfect because of other reasons, will be delayed on the line, the new on-line time to be determined.
消息称原定于20日上线的“京东团购”频道因后台系统不完善等原因，将推迟上线，新上线时间未定。
The idea of ILC is to gradually revise imperfect control input using the error between system output and the desired trajectory and realize perfect tracking in a finite time interval.
迭代学习控制的基本思想是基于输出信号与给定目标轨迹的偏差不断修正不理想的控制输入信号，实现在有限时间区间的完全跟踪任务。
It is a curious fact that in bad days we can very vividly recall the good time that is now no more; but that in good days we have only a very cold and imperfect memory of the bad.
奇怪得很，人们在倒楣的时候，总会清晰地回忆已经逝去快乐时光，但是在得意的时候，对恶运时光只保有一种淡漠而不完全的记忆。
It is a curious fact that in bad days we can very vividly recall the good time that is now no more; but that in good days we have only a very cold and imperfect memory of the bad.
奇怪得很，人们在倒楣的时候，总会清晰地回忆已经逝去快乐时光，但是在得意的时候，对恶运时光只保有一种淡漠而不完全的记忆。
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