此时每条染色体由一对染色单体构成，这两条联合的染色体称为四分体。
At this point esch chromosome consist of a pair of chromatids and the two associated chromosomes are termed a tetrad.
本文对饮酒组28例、对照组22例的外周血淋巴细胞姐妹染色单体互换、核仁形成区和随体联合进行了观察、统计。
The paper makes an observation and statistical study of 28 cases in drinking group and 22 cases in control group with peripheric blood of lymphatic sister chromatid exchanges (SCE).
联合国粮农组织认为藜麦是唯一一种单体植物即可基本满足人体基本营养需求的食物，正式推荐藜麦为最适宜人类的完美的全营养食品。
Quinoa is recognized by UN FAO as the only mono plant food, which can meet daily basic nutritional needs, and is recommended as the best whole food.
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