n.前身，先驱，先锋

原形：precursor复数：precursors

The amino acid precursor for the synthesis of proteins is glutamate.
氨基酸前体是蛋白质合成的原料。
The formation of DNA is a complex process involving multiple precursors.
DNA的形成是一个涉及多个前体的复杂过程。
Folic acid is a vitamin B9 precursor that plays a crucial role in cell division.
叶酸是维生素B9的前体，在细胞分裂中起关键作用。
The enzyme catalyzes the conversion of glucose to its metabolic precursor, fructose.
酶催化葡萄糖转化为代谢前体果糖的过程。
The precursor molecule for cholesterol is synthesized in the liver.
胆固醇的前体分子在肝脏内合成。
In chemistry, a nucleophile is an electron-rich species that acts as a precursor to a chemical bond.
在化学中，亲核试剂是一种电子丰富的物种，作为化学键形成前体。
The precursor to a volcanic eruption is often a series of small earthquakes.
火山爆发的前兆常常是一系列的小地震。
The RNA polymerase is a protein that helps synthesize RNA from its nucleotide precursors.
RNA聚合酶是一种蛋白质，帮助从核苷酸前体合成RNA。
The development of feathers from scales is a common evolutionary precursor among birds.
鸟类从鳞片发展出羽毛是一个常见的进化前兆。
The genetic code is a precursor to the expression of proteins, translating DNA's instructions into functional molecules.
基因密码是蛋白质表达的前体，将DNA的指令转化为功能分子。