帮助盲人过街是慈善的行为.It is an act of kindness to help a blind man across the street.他们大谈家庭、宗教和慈善的价值，但他们在个人生活中的表现却恰恰相反。They mouthed the values of family, religion and charity, but demonstrated the opposite in their private lives....
A method of synthesis of butyl isobutyrate catalyzed by amidosulphonic acid has been studied.以氨磺酸为催化剂催化合成了异丁酸丁酯,确定了酯化优化条件.The method about synthesis of approximate straight line motion mechanism based on moving centrode ...