Children become expert at holding their breath under water even before they can walk.

孩子们甚至在还没有学会走路时就已经能熟练地在水下屏住呼吸了。

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At a special swimming pool in Los Angeles, children become expert at holding their breath under water even before they can walk.

在洛杉矶的特别游泳池里，孩子甚至在会走路之前就能熟练地在水下屏住呼吸。

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Downloading and testing some of them might inspire you to become more of an expert at something that enriches your life more than any computer game ever could.

下载并测试其中一些程序可能会激发您成为某方面的专家，这比任何计算机游戏都更能充实您的生活。

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But it takes a great deal of skill to become an expert at wheel throwing.

VOA: special.2009.09.09

Both the Romney and Obama campaigns have become expert at keeping questions and answers to a minimum.

FORBES: The Cult of Access, Obama's Reddit AMA, and the Softball Question Problem

Actors' salaries remain depressed, and indies have become expert at exploiting competition between states and countries, which lavish subsidies on them.

ECONOMIST: Independent films are at last recovering from the slump

They have become expert at hunting out the best material at the lowest price from the thousands of sex sites online.

ECONOMIST: Electronic commerce