他们必须要遵守规定。
为了利用这一先进技术他们必须对计算机有基本的了解。
They have to have a basic understanding of computers in order to use the advanced technology.
他们必须承诺与年长的邻居共度时光。
They must commit to spending time with their older neighbours.
他们必须参加俱乐部活动。
他们必须得到一个要么是要么非的明确回答。
他们必须提出问题，而这些问题又将引出其他问题。
They have to ask questions and these questions lead to other questions.
首先，他们必须搞清楚火星上是否曾经存在过生命。
To begin with, they will have to find out whether life has ever existed on the planet of Mars in the past.
他们必须毫不犹豫地承认该组织是巴勒斯坦人民的唯一代表。
They must admit without equivocation or ambiguity that the organization is the sole and only representative of the Palestinian people.
奇怪的是，顾客似乎也忘记了他们必须支付他们购买的杂货的钱。
Strange is that seems customers also seem to forget that they have to pay for their groceries.
这些国家没有足够的本土工人，所以他们必须从其他国家招聘工人。
There are not enough native-born workers in these countries so they must recruit workers from other countries.
更多的祖父母会作证说，他们必须为孙辈支付昂贵的大学教育费用。
More grandparents would testify that they had to pay for their grandchild's expensive college education.
当人们扔掉食物垃圾时，他们必须通过扫描垃圾桶上的条形码来支付。
When people throw away food rubbish, they have to pay for it by scanning a barcode on the bin.
这些飞行器只能在太空中停留大约200天，所以他们必须尽快离开。
These vehicles are only rated to spend about 200 days in space, so they'll have to depart soon.
在将来他们必须生活在一起，他们不得不驯服自己心中过于自信的野兽。
The future numerous times they have to spend together, they have to tame the beast over-confident.
但是，如果政府不希望数据经济由这几个巨头控制，他们必须尽快采取行动。
But if government doesn't want a data economy controlled by a few giants, they must act soon.
他们必须专注于以恒定速度持续的自然过程，并且在岩石中留下某种有形的记录。
They would have to concentrate on natural processes that continue at a constant rate and that also leave some sort of tangible record in the rocks.
从他们吃的食物到如何与人互动，一切都是不同的，他们必须快速适应才能生存。
Everything from the food they eat to how to interact with people can be different and they have to adapt quickly to survive.
即使是最早的部落也有一种计算系统，哪怕不先进，也足以完成他们必须执行的任务。
Even the earliest of tribes had a system of numeration that, if not advanced, was sufficient for the tasks that they had to perform.
在工作中，人们很清楚他们应该做什么：工作，赚钱，为了获得收入而做他们必须做的事情。
At work, people pretty much know what they're supposed to be doing: working, making money, doing the tasks they have to do in order to draw an income.
他们必须对这些孩子采取点行动，因为很明显他们的行为已经出轨了。
They've got to do something about these children because clearly they've gone off the rails.
他们必须工作赚钱养家。
他们必须做出许多改变。
因此，他们必须确保时机准确。
他们必须用干净的水洗脸。
如果伤势严重，他们必须拨打120求助。
他们必须知道并遵守安全规则。
他们必须带上头盔以保护头部。
为了帮助熊，他们必须做一些试验。
父亲补充说，他们必须承诺要自己照顾这只猫。
The father added that they must promise to look after the cat by themselves.
他们必须时刻注意它们，这样他们就不会忘记它们。
They had to pay attention to them all the time, so they didn't forget them.
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