以下为句子列表：
英文: A planar tetradentate dinuclear ligand, 3, 5-bis(2-pyridyl) pyrazole, was synthesized by a three-step reaction of esterification, condensation and addition.
中文: 以2-吡啶甲酸为原料，经酯化、缩合、加成合成了平面四齿双核配体3，5-二（2-吡啶基）吡唑。
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英文: At this point esch chromosome consist of a pair of chromatids and the two associated chromosomes are termed a tetrad.
中文: 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。
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