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.
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.
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.
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.
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.
他表示，如果弹钢琴的儿童更聪明，这不一定意味着他们是因为弹钢琴才更聪明。
If children who play the piano are smarter, he says, it doesn't necessarily mean they are smarter because they play the piano.
孩子们一起回家去了，他们心里非常高兴。如果他们没有死，他们现在一定还活着。
The children went home together, and were heartily delighted, and if they have not died, they are living still.
他们发现，早期的注意力技能是学业成功最一致的预测因素，同伴的友善程度对学习成绩也有一定的影响。
They found that early attention skills were the most consistent predictor of academic success, and that likability by peers also had a modest effect on academic performance.
当他和其他研究人员研究为什么青少年在其他青少年的陪伴下更敢于冒险这一问题时，他们开始怀疑群体的影响不一定总是负面的。
As he and other researchers examined the question of why teens were more apt to take risks in the company of other teenagers, they came to suspect that a crowd's influence need not always be negative.
如果娜娜和他们在一起，她现在一定已经在迈克尔的额头上缠了绷带。
If Nana had been with them, she would have had a bandage round Michael's forehead by this time.
你可能会认为他们一定很弱。
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。
When we were coming down, we met another family with two young girls, who must have been just behind us.
他们想回到家后说：“你们一定不敢相信我做了什么！”
They want to go home and say "You won't believe what I did!"
他们想要获得一定程度的敏捷性，以使他们可以随时增加应用的规模。
They want to achieve a level of agility that allows them to incrementally scale applications on-demand.
只要房主符合一定条件，将向他们提供机会修改贷款方式。
Give homeowners the chance to have their loan modified, provided they meet certain criteria.
这并不表示你一定得成为他们最好的朋友，只是一同分享活动的乐趣。
This does not mean you have to be their best friend, but just share in their activities.
这是在圈养环境下对黑猩猩所做的研究，它并不一定反映他们在真正野外世界的行为。
But studies of chimps in captivity where they are exposed to human behaviors do not necessary reflect how they act in the real world.
这是在圈养环境下对黑猩猩所做的研究，它并不一定反映他们在真正野外世界的行为。
But studies of chimps in captivity where they are exposed to human behaviors do not necessary reflect how they act in the real world.
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