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There was a long lag in forwarding mail to us. 转寄给我们的邮件晚了很久才拿到。
lag covariance 落后协方差
Be modest, otherwise you will lag behind. 要谦虚，否则就要落后。
There is a time lag of about 10 years. 有大约十年时间的间歇。
I felt completely disorientated with the jet lag. 我乘长途飞机後因生理节奏失调而感到昏昏沉沉的。
The children always lag behind when we go for a walk. 我们出去散步时，孩子们总是落在后面。
If your payments of rent lag behind, you will be asked to leave. 你要是不能按时付房租，就要请你搬家。
You'll lag behind unless you study harder. 你如不更加努力地学习就要掉队。
The covariance index number model. 统计指数模型。
Let not a single classmate lag behind. 不要让一个同学掉队。
Some of the runner in the race begin to lag. 参加比赛的运动员中有一些开始落后了。
Increasing the total time lag is destabilizing. 增加总时滞将使稳定性降低。
We still lag behind in this respect. 在这方面，我们还比较落后。
They do not like to lag behind the others. 他们不愿意落在人后。
The data on covariance presently available are here. 目前所能获得的关于协变的资料都在这儿。
To fail to keep up a pace; lag behind. 落后跟不上步伐；落后
If you lag your hot water tank, you'll save money on your fuel bill. 如果你给热水箱装上外套，你就可以少付燃料费帐了。
After the long journey from China to America, the jet lag made him uneasy. 经过长途旅行由中国飞往美国之后，时差感令他很不舒服。
We have jet lag for nearly seven hours. 我们接近有七个小时的时差。
The Covariance function uses the biased population formula. Covariance函数使用有偏差总体公式。