俞敏洪说：背完这100个句子，你已经背过7000个单词！！！

何航

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。

何航

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。

何航

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。