俞敏

51. Using many symbols makes it possible to put a large amount of inFORMation on a single map.51.使用多种多样的符号可以在一张地图里放进大量的信息。52. Anarchism is a term describing a cluster of doctrines and attitudes w

41. The annual worth of Utah’s manufacturing is greater than that of its mining and farming combined.41.尤它州制造业的年产值大于其工业和农业的总和。42. The wallflower is so called because its weak stems often grow on wa

31. Although apparently rigid, bones exhibit a degree of elasticity that enables the skeleton to withstand considerable impact.31.骨头看起来是脆硬的，但它也有一定的弹性，使得骨骼能够承受相当的打击。32. That xenon could n