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。

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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。

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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。

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These games do not provide learning per se but create a set of competitive games where you do better if you have paid attention in class.

FORBES: Can Apps Transform Learning into Games?

The Children and Young People Bill will entitle three and four-year-olds to 600 hours of free early learning nursery education per year.

BBC: Pre-school nursery hours to increase in Scotland

This lowers the cost per test, ensures that learning is retained, and maximizes the chances of the experimental regime outlasting individual sponsors and team leaders.

FORBES: Three Ways To Make Big Data Make Money