It is difficult to make oneself concentrate for long periods.
让自己长时间聚精会神是很困难的。
They can not live for long periods in cold weather.
它们不能在寒冷的天气中长时间生存。
Being lonely for long periods of time is not a great feeling.
长时间的孤独并不是一种好感觉。
Sitting in one position for long periods of time is nor healthy.
长时间保持一种姿势并不健康。
It'll have to operate for long periods of time in very cold temperatures.
它必须长时间在非常低的温度下运行。
There it remains, sometimes for long periods, before emerging at the surface again.
在那里，地下水在重新涌出地表之前，往往可以保存很长一段时间。
They have to operate for long periods of time before the costs of development have been recovered.
在收回开发费用之前，它们必须运作很长一段时间。
At the same time, both cattle and humans were more confined in their movements, staying much closer to permanent water supplies for long periods of time.
同时，牲畜和人类的行动范围都受到了更大的限制，在很长一段时间内都要待在离永久水源更近的地方。
And contracts often run for long periods.
而合同是长期的。
Some of them can loiter in the air for long periods.
一些无人机可以长时间的在空中盘旋。
Must be able to run reliably for long periods of time.
必须能够可靠地运行很长一段时间。
I've never been able to do it for long periods of time.
我是从来都躺不了那么长的一段时间。
Wear comfortable shoes and avoid standing for long periods of time.
穿着舒适的矮跟鞋和并避免长时间的站立是孕妇特别要注意的。
I can maintain the language, even if I go for long periods without using it.
我可以保持对这门语言的掌握，即使我长时间不用它。
Some stick together for long periods, but for others the association is transient.
有些粘在一起很长时间，但对其它来说伙伴关系则是暂时的。
The downside to that is that cached connections are held for long periods of time.
这种方法的不利之处是已高速缓存的连接要保留很长时间。
Chatting on the phone for long periods during office hours should not be tolerated.
上班时间没完没了打电话是不能容忍的。
For long periods of time, nobody said a thing, as everyone waited for the next update.
战况室在很长一段时间里都相当安静，所有人都在等待着任务的进展。
People are already playing casual games, in big numbers, and for long periods of time.
已经有大量的人在玩休闲游戏，玩游戏的时间也很长。
Though cities grew in size and number for long periods, they could decline and fall, too.
虽然长期来看，城市规模的大小和数量上不断扩大，但一定时期也会遭受缩减下降。
POPs do not degrade easily, but remain intact in the environment for long periods of time.
POP不易降解，可以长期完整地存在于环境中。
Absentee manager: Any situation in which the manager is invisible for long periods of time.
缺席的经理(Absenteemanager)：经理长时间不出现的情况。
Also the ability to stay focused for long periods of time will greatly increase your success.
同时，长时间保持专注的能力也将极大提高你的成功。
Holding locks for long periods can reduce the amount of concurrency that a database can support.
支持长期的锁定可以减少数据库支持的并发数量。
A popular argument is that other Asian economies grew by 8-9% for long periods, so why not India?
当前在印度有个流行观点，亚洲其他经济体的长期增长率能有8%- 9%，为什么印度就达不到呢？
Feet can develop tender spots, corns and calluses from wearing sandals for long periods at a time.
一次长时间的穿着，会引发脚部的痛点，脚底不平和皮肤硬结。
But LCDs are much more battery-hungry and are not so easy on the eye when reading for long periods.
但液晶屏极耗电池，长时间阅读容易视觉疲劳。
When you sleep for long periods of time, your body temperature doesn't rise as quickly in the morning.
当你睡了很长一段时间，你的体温不会在早晨上升得很快。
Do not put both hands in your pockets for long periods of time. This tends to make you look unprofessional.
别把两只手一直插在口袋里，这会让你看起来很不专业。
Do not put both hands in your pockets for long periods of time. This tends to make you look unprofessional.
别把两只手一直插在口袋里，这会让你看起来很不专业。
应用推荐