第三部分：翻译（满分15分）
第一节将下列句子翻译成汉语（共5小题；每小题1分，满分5分）。
66. Tricycles are worth using if you want to explore the narrow alleys (hutong) of old Beijing.
67. Like other animals, we are on guard until we know it is safe to relax.
68. They say that the low-temperature lake is unlikely to be able to support such large living creatures.
69. The tubes were attached to a long stick which helped keep the rocket moving in a straight direction.
70. Distance surgery will become common as doctors carry out operations from thousands of miles away, with each city having its own telesurgery outpatient clinic.