threo英θri'ːəʊ美θri'ːəʊBNC²³⁶²¹³⁺¹ 基本例句 苏¹⁰⁰ The synthetic product was consisted of equal proportions of four isomers including the active erythro-5R,6S and its enantiomer, and another two threo- enantiomers. 合成产物由等比例的四种异构体组成，包括具有活性的赤式-5R，6S和它的对映异构体，以及另外两个苏式异构体。 cnki