东北部和中部的几个州人口数量在减少，很可能将失去一部分众议院的议席，而南部的席位数有望增加。
Several states in the north-east and Midwest have lost population, and will probably lose seats in the House of Representatives (and electoral-college votes) to states in the South.
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。
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.
拙政园可以分为东部，中部和西部三部分，面积共计4.1公顷，对于私家园林来说，这已算很大规模了。
The garden is divided into eastern, central and western parts, which altogether add up to 4.1 hectares in area, which is quite large for private gardens.
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