His younger sister is studying economics.

他的妹妹在学经济学。

As a child she fought with her younger sister.

小时候她跟她的妹妹打过架。

She was furious at being upstaged by her younger sister.

她被妹妹抢去风头，感到气愤不已。

Jim's younger sister, Mary, wanted to help her brother.

吉姆的妹妹玛丽很想帮助她的哥哥。

I gave my younger sister a pen.

我把一支钢笔给了我妹妹。

Is she your younger sister?

这个是你妹妹吗？

He played with his younger sister.

他和妹妹一起玩。

She fights with her younger sister.

她和妹妹打架。

My younger sister has a yellow bag.

我妹妹有一个黄色的书包。

We regard her as our younger sister.

我们把她当做自己的妹妹。

I hear my younger sister calling me.

我听见我妹妹在叫我。

He has more than one younger sister.

他不止有一个妹妹。

You have a younger sister, don't you?

你有个妹妹，不是吗？

My younger sister is beside my father.

我妹妹在我父亲旁边。

Please keep away from my younger sister.

请离我的妹妹远一点！

His younger sister is coloring a picture.

他的妹妹正在给一幅画涂上颜色。

Is your younger sister a college student?

你妹妹是大学生吗？

She looks younger than her younger sister.

她看起来比她妹妹年轻。

Sometimes, the younger sister is very clever.

有时，妹妹也很机灵。

My younger sister was the partner of my walks.

我妹妹是同我一同散步的伙伴。

Later the younger sister said sorry to my brother.

后来这个妹妹向我哥道歉了。

An elder brother, a younger sister, an elder sister.

一个哥哥，一个妹妹，一个姐姐。

My younger sister likes singing and dancing very much.

我妹妹十分喜欢唱歌跳舞。

My family has my father, mother, younger sister and me.

我家有爸爸、妈妈、妹妹和我。

She was helped in these efforts by her younger sister Emily.

在这些努力中，她得到了妹妹艾米丽的帮助。

He is sometimes best matched with a younger sister of brothers.

他有时最适合与有哥哥们的妹妹配对。

Sometimes I think father is harder on me than my younger sister.

有时我觉得父亲对我比对妹妹更严厉。

The year I was fifteen, my younger sister reached the third grade.

我十五岁那年，我妹妹上了三年级。

I have one older sister, one younger sister and one younger brother.

我有一个姐姐、一个妹妹、一个弟弟。

Your Size M is so small that I have to give it to my younger sister.

你的 M 号太小了，我不得不把它给我妹妹。