芹菜没有作为保护层的表皮，这使得它几乎不可能洗刷掉用在常规的作物上的化学物质。
Celery has no protective skin, which makes it almost impossible to wash off the chemicals that are used on conventional crops.
Crutzen由于揭示了人造化学物质吞噬大气层中的臭氧保护层而分享了诺贝尔化学奖，他说这一“人类时期”是长是短尚不得而知。
Whether this "age of man" will be short or long is unknown, says Crutzen, who shared his Nobel for unmasking the man-made chemicals eating away at the atmosphere's protective ozone layer.
地球上的变化最令人烦扰的方面之一，是人类活动所产生的化学污染正在迅速破坏地球上部大气圈臭氧保护层。
One of the most disturbing aspects of the changes in Earth is the rate at which chemical pollutants produced by human activity are destroying the protective layer of ozone in Earth's upper atmosphere.
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