就看keeps it warm in winter and also insulate against summer heat这段
有and说明是平行结构,那么and前面连接的东西时态跟结构都要一致,那么and后面的动词是insulate,并没有加s,所以前面的keep也不用加s
就看keeps it warm in winter and also insulate against summer heat这段
有and说明是平行结构,那么and前面连接的东西时态跟结构都要一致,那么and后面的动词是insulate,并没有加s,所以前面的keep也不用加s