将其从常态环境中提取出来则难免去除了一些对其功能攸关的其他物质。

Removing them from their normal environment deprives them of the company of other substances essential for their function.

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预防或治疗行为问题的关键是学会教狗将其常态行为重新转化为在家庭环境中可接受的发泄行为。

The key to preventing or treating behavior problems is learning to teach the dog to redirect its normal behavior to outlets that are acceptable in the domestic setting.

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缓慢的、持续的变化可能是环境稳定时期的常态，而新物种的快速进化发生在环境压力时期。

Slow, continuous change may be the norm during periods of environmental stability, while rapid evolution of new species occurs during periods of environment stress.

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