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1·It's called environmental enrichment.

它被称为“环境的丰富。”

2·Carin says this future enclosure will be greatly improved in terms of environmental, behavioral and social enrichment for the lovely otter.

Carin说为这可爱的水獭修建的围栏将在环境，行为和社会三方面得到更大的改善。

3·The lake's environmental problems include accelerated eutrophication, or aging, caused by nitrogen and phosphorus enrichment.

太湖环境问题包括氮磷元素富集带来的富营养化。

4·During surficial processes, the migration and enrichment of chemical element are response to environmental changes.

表生作用过程中化学元素的迁移富集规律，是元素对环境条件变化响应的表现。