更为严重的是，如果把年龄和学科联系起来，很多组合都表明孩子们得到的帮助越多，功课就越差。

Damningly, in many combinations of age and subject, the more help children got, the less well they did.

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但若组合里只有股票和债券，我的标准差会高得多。

But if I would confine myself just to stocks and bonds, then I would get a much higher standard deviation.

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连接差速压力开关线至组合阀。

Connect differential pressure switch wire to the combination valve.

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