美国快速帆船曾是顶极的帆船。

American clippers were the ultimate sailing ships.

《柯林斯英汉双解大词典》

在人口仍然年轻化的美国，它目前占总人口增长的40%，而在快速老龄化的西欧，这一比例约为90%。

In still-fertile America it currently accounts for about 40% of total population growth, and in fast-ageing western Europe for about 90%.

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美国肺脏协会（ALA）已经发布了对抗感冒和流感的新指南，其重要意义之一是能够快速地将两者区分开来。

The American Lung Association (ALA) has issued new guidelines on combating colds and the flu, and one of the keys is being able to quickly tell the two apart.

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