He was a tubby little man in his fifties, with sparse hair.他50来岁,头发稀疏,身材矮胖。Many slopes are rock fields with sparse vegetation.许多山坡都是石头地,植被稀疏。The sparse line of spectators noticed nothing unusual.那一排稀稀落落的观众没留意到任何不寻常之处。...
In this paper , the uniquely functionalized antifoulant acrylamide monomers derived are designed and synthesized.分别以含辣素衍生结构的丙烯酰胺为防污剂、以含辣素衍生结构的丙烯酸树脂为成膜物质制备两类防污涂料....