... three-dimensional structure 立体结构 three-in-one unit 三用装置 threshold quantity 临界值 ...
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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。
DNA and RNA are made of nucleotides. Each unit is a three-part molecule with a phosphate at one end, a sugar in the middle and a variable nucleobase at the other end.
DNA和RNA都是由核苷酸构成，每一单元为由三部分组成的分子，一端是磷酸盐，中部是一种糖，另一端是碱基。
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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