The concept was invented by a group of students at Brown University in Rhode Island after a friend complained of waking up tired and performing poorly on a test.
这一概念是由罗德岛州布朗大学的一群学生创造的，因为他们的一个朋友抱怨说早上起来很累，考试发挥得很差。
Researchers took a group of teenagers who had never smoked and for one year tracked whether they took up smoking and how their mental health changed.
研究人员找来一组从不吸烟的青少年，用一年的时间追踪他们是否开始吸烟以及他们的心理健康如何变化。
In the park, you see a group of people, all looking up at the sky.
在公园里，你看到一群人，都在仰望天空。
The Chinese make up the largest single ethnic group in the city's public classrooms.
华人在该市公立学校的课堂中构成最大的一个族群。
We're going independent from the university and setting up our own group.
我们将从大学独立出去，成立我们自己的集团。
She set up a self-help group for parents with overweight children.
她成立了一个由超重儿童家长组成的互助会。
They were able to walk faster, had improved balance, and were also able to get up out of a chair faster than the control group.
他们能够走得更快，提高了平衡感，也能比对照组更快地从椅子上站起来。
By the time the group got up to leave, it was pouring outside.
这群人准备起身离开时，外面下起了倾盆大雨。
Even without being taught new words a control group caught up with the other infants within a few months.
即使不教新单词，对照组也在几个月内赶上了其他婴儿。
A charity group set up a stand to raise funds.
一个慈善团体设立了一个摊位来筹集资金。
We broke up into groups, and each group designed its own toy and made an alpha prototype.
我们分成几个小组，每个小组都设计了自己的玩具并制作了一个alpha原型。
Do you hate that moment when you stand up in front of a group to speak and everybody looks at you?
你讨厌站在一群人面前讲话，每个人都看着你的那种时刻吗？
Assisted migration means picking up members of a species, or members of a group of interdependent species and physically moving or translocating them.
辅助迁移指的是挑选一个物种的成员，或一组相互依赖的物种的成员，并在物理上移动或迁移它们。
If your project is being resisted, for example, by a group of veteran employees, ask another old-timer to speak up for it.
例如，如果你的项目遭到一群资深员工的反对，那就另请一位老前辈为它辩护。
A survey by Barna research group found the top reason given by Americas for the fake news phenomenon is "reader error," more so than made-up stories or factual mistakes in reporting.
巴纳研究集团的一项调查发现，美国人认为出现假新闻现象最主要的原因是“读者错误”，而不是编造的故事或报道中的事实错误。
At office meetings and in group discussions, they might speak up more often, express strong opinions and come up with more creative and practical ideas than their male colleagues.
在办公室会议和小组讨论中，她们可能会比男性同事更经常地发言、表达强硬的观点，并提出更具创造性和实用性的想法。
Dominic, the show-off of the group, picked up one measly pear, put it on top of his snout, and performed a balancing act as we made our way back to the cave.
多米尼克，队伍里最爱耍酷的家伙，拿起一个很小的梨子，把梨子顶在鼻子上玩找平衡的杂耍，在我们回山洞的路上捣腾个没完。
At the front of the supermarket a charity group had set up a stand selling cooked sausages and flowers to raise funds.
一个慈善机构在一个大超市的前面设立了一个卖熟香肠和鲜花的摊位来筹集资金。
A group of water bugs was talking one day about how they saw other water bugs climb up a lily pad and disappear from sight.
一天，一群水生蝽在谈论它们如何看到其它的水生蝽爬上睡莲花的叶子，并从视线中消失。
We are finally waking up to the severity of the problem by supporting and developing a group of tools, apps and approaches intended to prevent scammers from getting through.
我们终于意识到问题的严重性，并通过支持和改进一系列工具、应用程序和方法以防止骗子得逞。
A flash mob is a group of people who come together suddenly in a public place, do something unusual for a short period of time, and then quickly break up.
快闪族，是指一群人突然在公共场所聚集，在短时间内做一些不寻常的事情，然后迅速散开。
We set up this group to help disabled people like Ben Smith.
我们成立这个组织是为了帮助像本·史密斯这样的残疾人。
They have decided to set up a group to help the stay-at-home children.
他们决定成立一个小组来帮助留守儿童。
Our group is two years old and made up of 14 students.
我们团队成立两周年了，由14名学生组成。
In January this year, the Marine Conservation Society (MCS)—a group of people who work to protect the UK's seas and coast—asked local schoolchildren to come up with suggestions.
今年1月，海洋保护协会（MCS）——一个致力于保护英国海洋和海岸的组织——请求当地学生提出建议。
It's no small challenge for a blog run by a group of ordinary—if ambitious—young people, but the members of Generation O are up to the task.
对于由一群普通——如果有抱负——的年轻人运营的博客来说，这是一个不小的挑战，但GenerationO 的成员会胜任这项任务。
That would show they would do anything to cover up for this group.
她问道，“这样会证明他们可以为了这个集团做任何事情。
Theo, however, was different because he always played up an age group.
然而西奥不同，他总是在较高级别组踢球。
Scaling up app-group (app-group-scaleup; Listing 9).
扩展app-group（app-group-scaleup；清单9）。
Scaling up app-group (app-group-scaleup; Listing 9).
扩展app-group（app-group-scaleup；清单9）。
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