The most widely used method oil estimating the probable amount of uncollectible accounts is based upon an aging of the accounts receivable.

预估无法收回应收账款的可能金额时最常用的办法是建立在应收账款的账龄分析上的。

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We believe that to focus on longevity as primarily an issue of aging is to miss its full implications.

我们认为，如果只把长寿看作一个老龄化问题，就是不理解它的完整意义。

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At around age 60, "muscles really start to break down," say Kathryn Starr, an aging researcher, "and because of that, the protein needs of an older adult actually increase."

在60岁左右，“肌肉真的开始分解，”一位研究衰老的研究员凯瑟琳·斯塔尔说，“也正因为如此，老年人对蛋白质的需求实际上增加了。”

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In practical terms,experts say, this will require the extensive upgrading of an aging infrastructure put in place before the ADA was came into being.

VOA: standard.2010.07.27

But the critics and supporters agree one of the British national health service's biggest challenges, as it enters its seventh decade, are the mounting cost of new technology and medicines, and an aging population.

VOA: standard.2009.09.24

Daldry takes things painfully slowly, not helped by a sappy score, and we are encouraged to muse upon the cultural shortcomings, or improvements, in the life of an aging member of the S.S. This is not an issue that most of us feel the need to worry about.

NEWYORKER: The Reader

Quickly, pirates seize Taddeo, an aging admirer of Isabella's, and try to sell him into slavery.

NPR: A Captive in Control: 'L'italiana in Algeri'

Meanwhile iTunes itself, an aging piece of desktop software, is overdue for a cloud-based replacement.

FORBES: Is Apple's North Carolina Battle Station Fully Operational?