Kids have a limited attention span.

小孩子不能长时间集中注意力。

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Young children have a limited attention span and can't concentrate on one activity for very long.

小孩子的注意力持续时间十分有限，不能长时间地专注于一个活动。

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However, it's important to consider the ecology of applications and events and use the notification system sparingly in order to make best possible use of the user's limited attention span.

然而，至关重要的是考虑应用软件所处的环境和事件，并经济地采用告示系统以便于尽可能最好地利用用户有限的注意广度。

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Kent needs to assume that readers are busy and have a limited attention span.

FORBES: Connect

But they also have a limited attention span, and they seem inclined to rush out of Iraq.

CNN: Nicholas Kristof: Running for the exits

The real problem lies with the limited attention span of a political system that barely notices the sacrifices and assumptions of past administrations and cares only about the fiscal run-up to the next election.

FORBES: How To Waste $100 Billion: Weapons That Didn't Work Out