Even in summer this place did not look exactly hospitable: in winter, conditions must have been exceedingly harsh.
即使在夏天，这个地方看上去也并不太宜人：在冬天，条件一定非常恶劣。
I remember thinking the waves must have been terrible that day.
我记得我在想那天的海浪一定很可怕。
They must have been inside the building, as their fur was badly hurt.
它们一定曾经在大楼里，因为它们的毛皮受了重伤。
When we were coming down, we met another family with two young girls, who must have been just behind us.
我们下来的时候，遇到了有两个小女孩的另一家人，他们一定就在我们后面。
John must have been joking when he said that he was going to live in Boston.
约翰说他要住在波士顿，这一定是在开玩笑。
We tend to think that people who lived at that time must have been pretty primitive.
我们倾向于认为生活在那个时代的人一定很落后。
Tom said that they must have been missed long ago, and no doubt the search was going on.
汤姆说他们一定很久以前就走丢了，毫无疑问，大家还在继续寻找他们。
Paul must have been trying to carry his waste paper to garbage can and dropped a few pieces.
保罗一定是想把废纸丢到垃圾桶里，结果掉了几张。
"In the storm of last night," answered the Dolphin, "the little boat must have been swamped."
“在昨晚的暴风雨中，”海豚回答说，“那小船一定是被淹了。”
At first everybody had thought that the house must have been robbed, but nothing was missing.
起初大家以为房子一定是被抢了，但什么也没丢。
He must have been so exhausted from impressing her that when she finally gave in, he gave out.
他给她留下深刻印象，一定是累坏了，所以当她终于让步时，他就筋疲力尽了。
They talked of Cinderella, and Tootles was confident that his mother must have been very like her.
他们谈到了灰姑娘，图图相信他的母亲一定很像她。
"It must have been that," said the King, "unless it was written to nobody, which isn't usual, you know."
“一定是那样，”国王说，“你知道的，除非它不是写给任何人的，这是不寻常的。”
Teotihuacán obsidian must have been recognized as a valuable commodity for many centuries before the great city arose.
在特奥蒂瓦坎这座伟大的城市崛起前数百年，它的黑曜石就必然已经被认为是极有价值的商品了。
The areas covered by this material were so vast that the ice that deposited it must have been a continental glacier larger than Greenland or Antarctica.
这种物质覆盖的区域十分巨大，因此使其沉积下来的冰一定是比格陵兰岛或南极洲更大的大陆冰川。
Huxley reasoned that flying vertebrates must have been warm-blooded because flying implies a high rate of metabolism, which in turn implies a high internal temperature.
赫胥黎推断，会飞的脊椎动物一定是温血动物，因为飞行意味着较高的新陈代谢率，而新陈代谢率又意味着较高的内部温度。
Some scholars, therefore, argue that the continent must have been discovered and mapped by the ancients, whose maps are known to have served as models for the European cartographers.
因此，一些学者认为，欧洲大陆一定是由古人发现并绘制的，古人绘制的地图被认为是欧洲制图者的模型。
I felt sorry for him and his colleagues – it must have been so frustrating for them.
我很同情他和他的同事们–这对他们来说肯定是非常令人沮丧。
It is strange to think that he held strong views on many things, but it must have been so.
想到当时他对许多事情的观点都很强硬，真是很奇怪，但那时应该就是这样。
Steam engines were used to pull the carriages and it must have been fairly unpleasant for the passsengers, with all the smoke and noise.
当时人们用蒸汽机来拉车，烟雾弥漫，噪音嘈杂，乘客肯定相当不舒服。
It must have been a custard tart early on, and it has spread around the world.
肯定是很早就有奶油蛋挞，然后在世界各地广为流传。
Macfarlane deduced that whatever the British were drinking must have been important in regulating disease.
麦克法兰推断，无论当时英国人喝的是什么，喝的这个东西都会对疾病的控制很重要。
In all the languages existing in the world today, there are complexities that must have been developed for years.
在当今世界上存在的所有语言中，肯定有已经发展多年的复杂性。
It's a sculpture carved from the tusk of a mammoth—it must have been towards the end of the tusk, because it's slim, slightly curved.
这是一件用猛犸象的象牙雕刻而成的雕塑——肯定是象牙接近尾端的部分，因为其形状纤细、略呈弧形。
Since cave dwellers normally lived close to entrances, there must have been some reason why so many generations of Lascaux cave dwellers hid their art.
鉴于穴居人一般都居住在洞口附近，因此，拉斯科岩洞许多代穴居者隐藏他们的艺术作品，其中必定存在某些原因。
Study of the textures of chondrules confirms that they cooled rather quickly, in times measured in minutes or hours, so the heating events that formed them must have been localized.
对陨石球粒质地的研究证实，它们的冷却速度相当快，短则几分钟，长则数小时，因此形成陨石球粒的高温活动肯定是局部的。
Recent discoveries on ophiolites indicate that there must have been a Paleotethyan geosuture zone bordering China and Vietnam.
最近发现的蛇绿岩指示中、越交界区发育一条古特提斯的地缝合线，。
I didn't see it. I must have been dreaming.
我没看见。我当时一定是在胡思乱想吧。
Morley: That must have been in the days before cars. Kathy: Yeah.
莫理：那一定是在还没有汽车以前的时候。
He writes, "Spock must have been driven by some motives or goals."
他写到，斯帕克一定，被某种动力或目标激励。
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