水中含量极小的化学成分minute amounts of chemicals in the water这两个词之间在意义上差别是极小的.There is a negligible difference in meaning between these two words.我住在一间极小的茅屋里.I live in a tiny cottage....
The degraded starch and acrylamide - butyl acrylate copolymer have been produced.本文制得了异相酸降解淀粉和丙烯酰胺 — 丙烯酸丁酯共聚物.Synthesis of n - butyl lactate is catalyzed by phosphotungstic acid and aluminium phosphotungstate.以磷钨酸和磷钨酸铝为催...