High levels of lead (at least 10 micrograms of lead per deciliter of blood) can lead to brain and nervous system damage, behavioral and learning problems and sluggish growth.
高浓度的铅(每分升血液中含铅10毫克以上)会导致脑部和神经系统受损，导致行动和学习能力方面的问题，还可能使发育缓慢。
However, one survey showed that 70 per cent of people thought learning English at three would be a good idea.
然而，有调查显示百分之七十的受访者认为三岁开始学习英语是个不错的主意。
Throughout the project, every individual, including the system test team members, was learning how to size the design, development, and test tasks per iteration.
在项目过程中，每个人，包括系统测试团队成员，都了解如何估量每个迭代的设计、开发，和测试任务。
Impressively, the learning of the second group also was comparable to that of a third group that for a week practiced the pitch-discrimination target task for 40 minutes per day.
第二组的学习成果与第三组相似，而第三组是连续一星期每天训练40分钟，这非常令人震惊。
Per time spent, reading the textbook is one of the least effective methods for learning new material.
按照花费的时间来计算，读教材是学习新知识效率最低的方法之一。
How much time per week do you spend in learning Chinese after class?
您课外每星期花在汉语学习上的时间有多少？
An average American wastes over 15 full days per year commuting. While we can't change our work environment overnight, we can change our learning environment.
美国人平均每年浪费超过15天在上下班路上。虽然我们不可能在一夜之间改变我们的工作环境，我们可以改变我们的学习环境。
Course is given priority to with professional study and Russian: professional learning every week 3-4, Russian 2-8 hours (45 minutes per period).
课程以专业学习和俄语为主：专业学习每周3 - 4时，俄语2 -8课时(每课时45分钟)。
Physics-education research (PER) has shown that interactive learning strategies significantly improve student understanding.
物理学教育研究（PER）表明，互动学习策略可以明显地提高学生的理解能力。
Just 29 per cent of those aged 18 to 34 said they would ‘actively encourage’ it, according to the poll commissioned by the Pearson Centre for Policy and Learning.
根据培生政策与学习中心（Pearson Centre for Policy and Learning）所进行的民意调查结果，这些18—34岁的受访者中只有29%的人说他们会“积极鼓励”这一行为。
After learning Liberal Studies, are there any changes concerning your habit of discussing current affairs online per week?
学习通识教育后，你每星期于网上讨论时事的习惯有否改变?。
Inspired by the success of PER, the AER community has conducted valuable research on teaching and learning in astronomy.
天文学教育研究界受到了物理学教育研究成功经验的启发，在天文学教学方面进行了一项颇有价值的研究。
How many hours you spent in learning this course per day except leaning in class?
除了上课，你每天花多少时间学习这门课？
How many hours do you spend in learning English per day except learning in English class?
除英语课堂学习外，你学习英语平均每天所花的时间。
In regards to college life, we only have 12 hours per week of class time, so learning how to manage your time is really important.
关于课余生活，到了大学以后，我们一周的课时总数就只有12个小时，学会如何管理和分配课余时间非常重要。
They discovered that high melatonin did not affect learning per se, but dramatically reduced the fishes' ability to form new memories, or to remember what they'd learned.
研究人员发现大量的褪黑素没有直接影响学习本身，但是却很大程度地使斑马鱼的记忆衰退，斑马鱼不记得学过的东西。
If you spend an hour per day in the car learning instead of cursing at other drivers or listening to Britney Spears, you will have attended the equivalent of an entire semester course.
如果你每天用一个小时的时间来学习开车，而不是诅咒其他司机或者听小甜甜布兰妮的歌，那么你就相当于学会了整个学期的课程。
We found traders increased their Sharpe ratios significantly during the two years of the study -indicating they were learning to make more money per unit of risk.
我们发现，在我们研究的这两年内，交易员的夏普比率大幅提高。这表明他们在不断学习如何提高单位风险的盈利。
At home listening to English tape, not less than 1 hour per week, best can insist every day listening to 10-15 minutes, which are of great help for learning. 5.
在家听英语磁带，每周不少于1小时，最好能每天坚持听10——15分钟，这将对学习有很大帮助。
What we're learning is that the average gift is approximately $15 per consumer that uses that option.
据我们了解，大约有15%的消费者选择这种方式。
What we're learning is that the average gift is approximately $15 per consumer that uses that option.
据我们了解，大约有15%的消费者选择这种方式。
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