1987年一项条约规定逐步停止使用氯氟烃被认为是促使臭氧停止变薄的原因。

A 1987 treaty that phased out the use of CFCs is believed to have worked to halt the thinning.

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联想有权在5年内使用IBM的名字，但是当消费者意识到产品并没有多大变化时，联想仅仅2年左右就逐步停止使用IBM的标志。

Lenovo had the right to use the IBM name for five years but phased it out after just two, as consumers realized the product had largely stayed the same.

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