One of the most useful techniques comes from a practical application of the old right tool for the right job rule known as embedding.

最有用的技术之一来自选择合适的工具做合适的事情这一古老规则的实际应用，采用嵌入技术。

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This includes practical items such as study materials, old class notes, favorite textbooks or pens and even the contact details of previous teachers.

这包括一些实用的东西，例如学习资料、以前的课堂笔记、喜爱的教科书或钢笔，甚至是以前教过你的老师们的详细通讯方式。

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But chemical knowledge is as old as history, being almost entirely concerned with the practical arts of living.

但化学知识却象人类历史一样古老，与人们实际生活密切相关。

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Moreover aspects such as mutual care within traditional gender roles and bringing up children as a form of old-age insurance had huge practical importance and were much more important than romantic love.

BBC: News | Talking Point | Is marriage an out-dated institution? Read the first comments we received.