Antarctica is accessible by sea for a few weeks in summer and expeditions usually aimed to arrive in January or February.
在夏季的某几个星期，人们可以乘船到达南极洲，而极地考察通常在1月或2月进行。
At 400 kilometers, orbital lifetimes are usually measured in a few months without re-boost. At 200 kilometers this drops to a few weeks.
在400公里高的轨道上，不推进的话，卫星的轨道寿命通常是几个月，200公里高度的轨道寿命是几周。
This can take a little bit of time but usually can take no longer than a few weeks.
这可能需要花费一点点的时间但通常不会超过几个星期。
I've spent the last few weeks sleeping in what usually serves as a storage room in my parents' home, before I leave for a job as an SAT tutor in Central America.
在我去中美洲找SAT助教工作之前的最近几个星期，我一直睡在我父母家的储藏室里。
Usually corneal reactions occur soon after starting the drug and disappear a few weeks after it is withdrawn.
通常角膜的异常发生在服药之后，停药后这种发应就会消失。
Usually it's younger women, but my husband saw a man in flannel pajama pants at the liquor store a few weeks ago buying a six-pack.
通常是较年轻的女性，不过几周前我丈夫曾在卖酒的店里看到过一个穿法兰绒睡裤的男人买了半打装的酒。
Acute low back pain usually lasts for a few days to a few weeks and is caused by general work around the house or trauma from a sports or other injury.
急性腰痛，通常持续几个星期到数天，由周围的房子，或从运动创伤或其他一般工作造成伤害。
This type of non-allergic rhinitis usually clears up within a few weeks but can cause lingering mucus in the throat (post nasal drip).
这种类型的非过敏性鼻炎通常将在几周之内，但可能会导致徘徊在喉咙里的粘液（后鼻滴）。
Gordon: Yes, we must take an entrance exam, but it is much easier than the Chinese one. We usually only need to study for a few weeks.
戈登：是的，我们要参加升学考试，但比中国的高考容易多了。一般来说，我们只需要复习几个星期就可以了。
Kelly: Oh, right. I usually come in the evening, but I just joined a few weeks ago. I'm trying to get into shape for the summer.
难怪，我通常是晚上来，不过我是前几个星期才加入的。我想在夏天来临前把身体练好。
Like their aquatic counterparts, pet chickens don't have very long life expectancies, usually hanging on for just a few days or weeks.
跟他们水生的同伴一样，宠物小鸡不会活得很长，通常能活几天或者几周。
I find my idea (usually takes me a few weeks to a month), then I sit down and think how I could do it using AoK and if it's possible to do it.
先找到一个构思(通常会花费我几周到一个月的工夫)，然后坐下思考我怎样用帝国来实现和是否能实现。
He usually went to France or Germany for a few weeks during his summer holidays, and he spoke French and German quite well.
在暑假期间他通常到法国或德国去度几周的假，他的法语和德语都讲得相当好。
I've worked on many projects before, but they are usually completed within a year, if not within a few weeks or months.
我以前做过许多计划，但是它们经常一年内就结束了，要么就是只持续了一周或几个月。
Usually, micro films have small budgets and are completed in a few weeks.
通常，微电影都是在数周内拍摄完成的小成本制作。
They usually disappear after a few weeks and you may not have symptoms again for several years.
这些症状常常在很短的几周内就消失，而且有可能在今后的几年内都不会再出现。
However, planning for more than a few weeks is usually inefficient, so I would not worry too much about that.
然而，计划几周的事情通常会无效率的，因此也无需多担心。
Postpartum depression after the birth a child generally occurred within a few weeks, usually a week or less.
产后抑郁症一般在生完小孩后的几周内发生，一般持续一周或更短的时间。
But a stock being extremely oversold is usually an acute phenomenon that lasts for only a few weeks.
然而股票被严重超卖所持续的时间不会超过几个星期。
But a stock being extremely oversold is usually an acute phenomenon that lasts for only a few weeks.
然而股票被严重超卖所持续的时间不会超过几个星期。
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