The ornithologists made Vs with their thumbs and forefingers, measuring angles.鸟类学家们用大拇指和食指构成V形量测角度.Her flat head and nose were made by pinching the clay between the forefingers.她的平头和鼻子都作出捏食指之间的粘土....
Phenyl ( or polyphenyl ) substituted epoxides serve as excellent precursors to phenyl ( or diphenyl ) carbenes.某些苯代 ( 或多苯 ) 环氧乙烷是制取带苯环 ( 或二苯 ) 碳烯的极好原料.The epoxides were obtained with up to 90 % yields in the reaction sys...