Only the well - to - do can afford these houses.只有富人能买得起这些房子.He was born of fairly well - to - do parents.他出身于相当富裕的家庭.In contrast, the lives of girls in well-to-do families were often very sheltered.相反，生活在富裕家庭的女孩子通常都备受呵护...
There are many amino acids that the body cannot synthesise itself.有许多种氨基酸人体自身不能合成.There are many amino acids that the body cannot synthesize itself.有许多种氨基酸人体自身不能合成。Alanine appears to be the preferred amino acid in the tr...