A methyl group is a basic unit in organic chemistry: one carbon atom attached to three hydrogen atoms.

甲基是有机化学的基本单位：一个碳原子连接三个氢原子。

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Siemens AG is combining its three global carrier divisions into one unit in an attempt to reduce costs in administration, sales and research and development.

西门子正在将其三个全球运营商分部合并为一，以降低管理、销售和研发的成本。

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One of the three large classes of substances in foods and living cells, lipids contain more than twice as much energy (calories) per unit of weight as the other two (proteins and carbohydrates).

是血液和生物细胞内三大类物质之一，以单位重量所包含的能量（卡路里）计，类脂化合物是其它两种（蛋白质和碳水化合物）的两倍还要多。

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