Health and fitness have become essential to our household and our lives.

健康和运动已经成为了我们日常生活的必要元素.

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Oxygen is necessary to support life.

氧是维持生命的必要元素.

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A proteolytic enzyme in plasma that dissolves fibrin and other blood clotting factors.

脊椎动物血液中产生的微小原生质;血液凝结的必要元素.

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This paper discussed the necessary elements of the safty system construction of network.

讨论了网络安全体系构架包含的必要元素.

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