Small children have a short attention span.

幼儿注意力持续时间短。

《牛津词典》

Small children have a very short attention span.

幼儿的注意力持续时间很短。

《牛津词典》

There is the danger that the high-speed connectivity of the Internet will reduce our attention span—that we will be incapable of reading anything of length or which requires deep concentration.

风险在于，互联网的高速连接会减少我们的注意力持续时间，从而导致我们不能阅读长篇论著，或是需要高度集中注意力的书籍。

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In other words, a crossword puzzle may be a good remedy for an ailing attention span.

FORBES: Health

Johnson provides a method for lengthening your attention span using similar techniques to marathon training.

FORBES: Connect

As far as trading these markets, you certainly need to have a short attention span.

FORBES: How To Trade This Market Meltdown