知识贝壳
所属栏目:汉英医学常用词表达
hundreds of thousands; thousands upon thousands ;① 虽然自然界中只有100多种元素,可是它们却构成世界上成千上万种物质。① Though a little over 100 elements in nature, they combine to form thousands upon thousands of different substances in the world.② 美国每年有成千 ......(本文共 280 字 ) [阅读本文] >>