Nutritionists say only 33% of our calorie intake should be from fat.营养学家说我们所摄入的卡路里中只应有33％来自脂肪。Judging from his accent, he must be from Hunan.从他的口音判断, 他一定是湖南人.This letter must be from Frank; I recognized his scrawl.这封信一定是...
Less common reagents that attack polymers include acids, bases.比较不常见的浸蚀多聚物的化学浸蚀物有酸 、 碱.Lactones are major chemicals used in the preparation of other organic reagents.内酯是制备其他有机试剂的重要化学品.They experimented with new reagents ...