A generation ago, it was thought that babies born this small could not survive.

在上一代以前，人们认为这么小的新生儿是没法存活的。

《柯林斯英汉双解大词典》

Practically unheard of a generation ago, the discounts have become a routine part of many businesses—as common as color televisions in motel rooms and free coffee on airliners.

上一代人几乎闻所未闻的打折已经成为许多企业的惯用手段——就像汽车旅馆房间里的彩电和航班上的免费咖啡一样普遍。

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American relations with Mexico, though much warmer than a generation ago, are still prickly.

ECONOMIST: George Bush inspires high hopes, and a few fears

Did any economist a generation ago predict the Internet or the explosion in bandwidth?

FORBES: Fact And Comment

Energy is a smaller part of the average household budget than it was a generation ago.

NPR: Oil Prices at Record High; Experts Look for Fallout