Groups of angry youths hurled stones at police.

一群群愤怒的年轻人朝着警察猛掷石块。

Groups of drunken hooligans smashed windows and threw stones.

成群醉酒的小流氓打碎了窗户，乱扔石头。

There are no significant differences between the two groups of students.

这两组学生没有明显差别。

Unsupported mothers are one of the fastest-growing groups of welfare claimants.

无经济支持的母亲们是申请福利的群体中人数增长速度最快的一部分。

Groups of unemployed people from all over the country marched in procession to the capital.

来自全国的失业群众列队向首都进发。

The two biologists found, to their surprise, that both groups of birds survived equally well.

这两位生物学家惊奇地发觉，两组鸟都同样很好地活了下来。

Groups of tourists crowded the main streets.

大街上挤满了成群的游客。

Other times, bad ideas can cause problems for certain groups of people.

有时候，坏主意会给某些群体带来麻烦。

I give speeches many times a year to groups of every possible description.

我每年要给各种各样的团体演讲很多次。

In the depths of the French Guyanese rainforest, there still remain unusual groups of indigenous people.

在法属圭亚那热带雨林的深处，仍然有罕见的土著人群体。

There are three groups of English learners: beginners, intermediate learners, and learners of special English.

英语学习者分为三组：初学者、中级学习者和特殊英语学习者。

Fresh groups of guests arrived.

新客成批到达了。

She split the class into groups of four.

她按四人一组把全班分成若干小组。

First get students to form groups of four.

首先让学生分成四人一组。

A fight broke out between rival groups of fans.

比赛双方球迷打了起来。

She asked her students to get into groups of four.

她让学生每四人分为一小组。

Fighting had broken out between rival groups of fans.

双方球迷发生了打斗。

The two groups of children have quite different characteristics.

这两组儿童具有截然不同的特点。

Young adolescents are happiest with small groups of close friends.

年轻的青春期少年们和一小圈亲近的朋友在一起时最高兴。

There was a lot of bad feeling between the two groups of students.

这两群学生互怀敌意。

The students work individually, then pool their ideas in groups of six.

学生先分头工作，然后六人一组交流心得。

Ordered arrangements of large groups of atoms and molecules are highly improbable.

大的原子群和分子群的有序排列是极不可能的。

Some groups of consumers are slow to pick up trends in the use of information technology.

有些顾客群对信息技术应用方面的潮流反应迟钝。

They compared the fat intake of groups of vegetarians and meat eaters, and matched their diets up with levels of harmful blood fats.

他们比较了素食者组和肉食者组的脂肪摄入量，并把他们的膳食和血脂危险水平对应起来。

Groups of wind turbines are known as wind farms.

风力涡轮机组被称为风力发电场。

It's necessary to wear the mask in the groups of people.

在人群中戴口罩是必要的。

Every morning Tim often sees some groups of middle-aged women dance in the square.

蒂姆每天早上经常看到一些中年妇女在广场上跳舞。

In his study two groups of people listened to a person talking in a noisy room.

在他的研究中，两组人听一个人在嘈杂的房间里讲话。

More than thirty groups of scientists are working to develop a vaccine for COVID-19. (scientist)

30多个科学家小组正在努力研制新冠病毒的疫苗。

To show that they were right, they gave two groups of students a problem to work out.

为了证明他们是对的，他们给两组学生出了一道题，让他们去解决。