It's a piece of chalk.

Please bring him a piece of chalk.

请带一支粉笔给我.

Please give me a piece of chalk.

请给我一支粉笔.

The teacher wrote on the blackboard with a piece of chalk.

老师用一支粉笔在黑板上写字。

I come upon a group of children play in the street.

我遇到一群孩子在街上玩耍。

The teacher walked out of the classroom, followed by a group of children.

教师走出教室，后面跟着一群孩子。

When we get there, a group of children come to have a class.

当我们到达那里的时候，正好碰上一群孩子来上消防课。

On the side lawn a group of children sing and dance.

那边草地上有一群孩子在唱歌跳舞。

On my way home from work, I saw a group of children flying kites.

在下班回家的路上，我看见一群小孩在放风筝。

A group of children are singing.

一群孩子在唱歌。

A group of children were goading another child in the school playground.

一群孩子在学校的操场上嘲笑另一个孩子。

The picture shows a group of children enjoying themselves in a pool, with two of them splashing down a water slide.

图片展示的是一群孩子在一个游泳池中快乐地玩耍，其中两个孩子正从水滑梯上滑下来，溅起一片水花。

The Narnia stories tell of a group of children in this fantasy land.

纳尼亚传奇讲述了这片梦幻之地上一群孩子的故事。

A group of children are playing in the garden.

一群孩子在花园里玩。

The epicenter of the outbreak is in Victoria, where a group of children are among those being treated.

爆发的中心在维多利亚州，其中一群儿童正在接受治疗。

A group of children from poverty stricken areas across China gathered on the outskirts of Beijing.

这群来自全国各地的困境少年，组成了一支特殊的棒球队，在困难中重生，与命运叫板！一群来自中国各个贫困地区的少年们相聚北京郊区。

We met a group of children returning from school.

我们遇到一群从学校回来的孩子。

A group of children will perform traditional dances.

一群儿童将表演传统舞蹈。

On Monday, a group of children from the Lo Hermida neighborhood in Santiago took part in the latest project.

周一，来自圣地亚哥附近社区的孩子们参加了最近的这次活动。

A group of children were lost in the inner part of the forest.

一群孩子在森林深处迷失了方向。

A group of children come for a camping in a town near the forest with their teacher.

一群小孩儿随老师来到林边小镇野营。