40. Studies of the gravity field of the Earth indicate that its crust and mantle yield when unusual weight is placed on them.
40.对地球引力的研究表明，在不寻常的负荷之下地壳和地幔会发生位移。

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 walls and along stony cliffs for support.
42.墙花之所以叫墙花，是因为其脆弱的枝干经常要靠墙壁或顺石崖生长，以便有所依附。

43. It is the interaction between people, rather than the events that occur in their lives, that is the main focus of social psychology.
43.社会心理学的主要焦点是人与人之间的交往，而不是他们各自生活中的事件。

44. No social crusade aroused Elizabeth Williams' enthusiasm more than the expansion of educational facilities for immigrants to the United States.
44.给美国的新移民增加教育设施比任何社会运动都更多的激发了Elizabeth Williams的热情。

45. Quails typically have short rounded wings that enable them to spring into full flight instantly when disturbed in their hiding places.
45.典型的鹌鹑都长有短而圆的翅膀，凭此他们可以在受惊时一跃而起，飞离它们的躲藏地。

46. According to anthropologists, the earliest ancestors of humans that stood upright resembled chimpanzees facially, with sloping foreheads and protruding brows.
46.根据人类学家的说法，直立行走的人的鼻祖面部轮廓与黑猩猩相似，额头后倾，眉毛突出。

47. Not until 1866 was the fully successful transatlantic cable finally laid.
47.直到1866年第一条横跨大西洋的电缆才完全成功的架通。

48. In his writing, John Crowe Ransom describes what he considers the spiritual barrenness of society brought about by science and technology.
48. John Crowe Ransom在他的著作中描述了他认为是由科学技术给社会带来的精神贫困。

49. Chil