According to the report, in general, the country's environment quality changed slightly in 2001, basically maintaining the level of 2000. However, the overall environmental situation remains grave.

《公报》表明，2001年全国环境质量总体变化不大，基本维持在2000年度水平，但全国环境形势依然不容乐观。

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The respiratory system plays an important role in maintaining our internal environment at the proper level of oxygen, by bringing the right amount in.

呼吸系统的重要性在于,通过向体内输入适量的氧气,维持人体内环境中的氧平衡

耶鲁公开课 - 生物医学工程探索课程节选

Maintaining the funding level provided by the expired government grant would mean a 2.5% council tax rise just for starters.

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Thus, House Republicans will find it very difficult to offset the cost of those tax cuts while maintaining the current level of progressivity.

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The system's 3D Surround Processor analyzes content to distribute sound in multiple directions while maintaining the appropriate balance level.

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