65.尽管模仿鸟学很多种鸟的鸣叫声惟妙惟肖，但人类还是能够依其声音上的线索很快识别它们。

65. Although mockingbirds superbly mimic the songs and calls of many birds, they can nonetheless be quickly identified as mockingbirds by certain aural clues.

64.珍珠的色泽受到作为其母体牡蛎种类及牡蛎生活水域的深度，温度和含盐度的制约。

64. The pigmentation of a pearl is influenced by the type of oyster in which it develops and by the depth, temperature, and the salt content of the water in which the oyster lives.

63.人类骨骼有二百多块骨头组成，住些骨头石油坚韧而相对缺乏弹性的，被称为韧带的结蒂组连在一起。

63. The human skeleton consists of more than two hundred bones bound together by tough and relatively inelastic connective tissues called ligaments.

62.电脑储存和由于电子微处理机得以实现的电控运用成倍的增加了现代打字机的功能。

62. The application of electronic controls made possible by the microprocessor and computer storage have multiplied the uses of the modern typewriter.

61.购买者和销售者都应该留意技术的新发展，原因很简单，因为技术能够并且已经影响着营销活动。

61. Buyers and sellers should be aware of new developments in technology can and does affect marketing activities.