In order for a chemical to be considered a drug, it must have the capacity to affect how the body works.
为了使一种化学物质被认为是一种药物，它必须具有影响人体运作的能力。
It is a truly delightful place, which looks the same as it must have done 100 years ago with its winding streets and pretty cottages.
这真是一个令人愉快的地方，它一百年前一定和现在看起来一样，有蜿蜒的街道和漂亮的小屋。
这准花了相当大的一笔钱。
It must have been one hell of a party.
那肯定是一次很棒的聚会。
It must have happened at about five o'clock in the morning.
这件事一定发生在凌晨五点钟左右。
It must have galled him that Nick thwarted each of these measures.
尼克对每一个措施都加以阻挠，这一定激怒了他。
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。
Women found him charming. It must have been his patter because he's not good-looking.
女人们觉得他有魅力。这肯定是因为他的顺口溜，因为他并不好看。
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。
It must have got into the dough by mistake.
它一定是不小心掉进面团里了。
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 having a meal.
它一定是在吃饭。
It must have come a bit expensive.
一定是贵了点。
It must have flown into the window.
它一定是飞到窗户上了。
The cow-herd said, "It must have run away."
牧牛人说：“它一定是跑掉了。”
"It must have been terrible," said little Gerda.
“那一定很可怕。”小小的格尔达说。
It must have been very crowded when you were there.
你在那儿的时候一定很拥挤。
It must have taken you a long time to fix up all these bookshelves.
你一定花了很长时间才把所有的这些书架修好。
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。
"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。”
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。
This is the first time that a structural difference has been found between the brains of women and men and it must have some significance.
这是第一次在女性和男性的大脑中发现结构上的差异，而且这一定有某种意义。
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。
吉米，肯定是你。
It must have been very painful?
肯定很痛吧？
It must have slipped out somewhere.
它一定是掉在哪里了。
Benjamin: It must have a long history.
本杰明：一定有很长的历史了。
It must have a public default constructor.
必须拥有公有的默认构造函数。
It must have been raining here last night.
昨晚这儿一定是下过雨了。
It must have haunted him until his dying day.
按理说，他应该感到内疚，直到他死去的那一天。
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