“同前”的拼音为：tóng qián...

“座前档”的拼音为：zuò qián dàng...

“前片”的拼音为：qián piàn...

研究人员还表示,在佩特里培养皿中的脑细胞前体可以发育成神经元.The researchers also showed that the progenitors mature into neurons in Petri dishes.植树细胞中丙氨酸和亮氨酸 、 缬氨酸的主要前体是丙酮酸.In plant cells the principal precursor of alanine , as well as leucine and v...