血红蛋白的理想数量帮助细胞得到足够的氧。

Having optimal haemoglobin levels helps the cells of the body receive sufficient oxygen.

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该研究还调查了人们的理想朋友数量。结果发现，英国人普遍有四个密友，但是他们的理想数量是六个。

The study also looked into the amount of friends we would like to have. It found that the average Brit has four close friends, but ideally we want six.

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我知道，幸福不一定包括2.5个孩子（据一项美国调查显示，一个美国家庭中孩子的理想数量是2.5个——译注）、位于郊区的房子和白色的栅栏。

I know that happiness does not have to include 2.5 children, a house in the suburbs and a white picket fence.

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