他们一定已经知道他们的父亲在暗地里做什么。
他们双方都有一定的道理。
为了解释这一点，他们假定银河系一定包含了大量无法探测到的不明物质。
To explain this, they hypothesize that galaxies must contain a great deal of missing matter which cannot be detected.
那房子一定花了他们不少钱。
他们一定富得流油。
他们是唯一没有一定程度自治权的美国主要土著群体。
They are the only major US native group without some degree of autonomy.
通常，镜像意味着谈话者享受他们的交流，并且他们之间有一定程度的共识。
As a rule, mirroring means that conversationalists enjoy their communication and that there's a certain level of agreement between them.
我猜他们对于那些听他们演讲的骑士和贵族一定很有吸引力。
I guess they must've been really appealing to those knights and lords who were listening to them.
他们一定很高兴。
他们一定把我和我弟弟杰克搞混了。
他们一定把我和我的孪生兄弟罗德搞混了。
对他们来说，这一定和现在我们登上月球一样困难。
This must have been as difficult for them as landing on the moon is for us today.
他们假设，语言多样性一定与历史、文化差异、山脉或海洋分隔人口有关。
They hypothesized that language diversity must be about history, cultural differences, mountains or oceans dividing populations.
他们假设，语言多样性一定与历史、文化差异、山脉或海洋分隔人口有关。
They hypothesize that language diversity must be about history, cultural differences, mountains or oceans dividing populations.
他们谈到了灰姑娘，图图相信他的母亲一定很像她。
They talked of Cinderella, and Tootles was confident that his mother must have been very like her.
他们的收入已经连续增长三年，所以情况一定很好。
They've had a continuous three-year rise in revenue, so things must be going well.
尽管制造商和零售商能够有一定把握地预测总需求，但要准确地预测需求将如何在他们销售的众多SKU中分配是困难的。
Even though manufacturers and retailers can forecast aggregate demand with some certainty, forecasting accurately how that demand will be distributed among the many SKU's they sell is difficult.
我们一定不能容许他们成功。
他们一定把宝藏藏在这里的某个地方了。
医学界也认为衰老是理所当然的，除了让人们维持一定程度的健康，他们无能为力。
The medical community also takes aging for granted, and can do nothing about it except keep people within a certain health range.
1998年公布的DNA证据在一定程度上刺激了他们，这些证据几乎可以肯定托马斯·杰斐逊和他的奴隶萨莉·赫明斯至少有一个孩子。
They have been spurred in part by DNA evidence made available in 1998, which almost certainly proved Thomas Jefferson had fathered at least one child with his slave Sally Hemings.
我们一定不能忘记：这些疾病影响“低层十亿人”，他们是生活在最难以到达的地方的穷人中的最贫穷者。
We must never forget: these diseases affect the "bottom billion", the poorest of the poor living in the hardest-to-reach places.
众筹可以成为研究人员争取公众参与的一部分，人们之所以做出捐赠，是因为“他们觉得自己与正在筹款的人有联系”，而不一定与科学有关。
Crowdfunding can be part of researchers efforts to reach the public, and people give because "they feel a connection to the person" who is doing the fundraising—not necessarily to the science.
英国人本应以自嘲著称，但就连他们的幽默感也有限度，英国零售商杰拉尔德·拉特纳在付出一定的代价之后才明白了这一点。
The British are supposed to be famous for laughing at themselves, but even their sense of humour has a limit, as the British retailer Gerald Ratner found out to his cost.
他们一定知道一些信息。
这种体系里的英文诗每行都有重读，然后将他们按一定模式排列。
It's a scheme that in English counts accents or stresses per line and then arranges them in a pattern.
治疗师们不能开药方，因为他们不一定具备医疗资格。
Therapists cannot prescribe drugs as they are not necessarily medically qualified.
他们的成功并不一定表示政治上转向左倾。
Their success does not necessarily reflect a leftward shift in politics.
随便他们干什么坏事吧，我们一定和他们拼到底。
Let them do their worst—we'll fight them every inch of the way.
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。
Tom said that they must have been missed long ago, and no doubt the search was going on.
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