Hydrogen combines chemically with oxygen to form water.

Division is a form of computation.

除法是一种运算方法.

Canals and rivers form the inland waterways of a country.

运河和江河构成了一个国家的内河水路.

His forehead knotted in a frown.

他眉头紧锁。

Billy's eyebrows knitted together in a little frown.

比利眉头微皱。

There was a deep frown on the boy's face.

男孩眉头紧锁.

The smile disappeared to be replaced by a doleful frown.

笑容消失了，取而代之的是哀伤的蹙眉。

She saw his frown and hastened to explain.

看到他皱起眉头，她赶紧解释。

He screwed his face into a frown.

他皱起眉头,面露愠色.

Don't frown at me like that.

不要那样对我皱眉(不高兴).

And trembled with fear at his frown.

而当他皱眉时她却因担心而颤抖.

Her beautiful face had a resentful frown on it.

她那俊俏的眉梢怨恨地蹙了起来.

A fiddly task like threading a needle often makes you frown.

烦琐的工作就像穿针引线一样,常常令你皱眉头.

Her frown gave him a speechless message.

她眉头一皱给了他一个暗示.

We can make a dimpled smile out of a frown.

我们能弄出个酒涡,使你愁容变笑靥.

At the dawn on the lawn the yawning drowned man began to frown.

拂晓时在草坪上,打欠伸的溺水者开始皱眉头.

Bt the dawn on the lawn the yawning drowned man began to frown.

拂晓时在草坪上,打呵欠的溺水者开始皱眉头.

His worried frown relaxed a little.

他紧蹙的愁眉稍稍舒展开了.

The mountains frown down on the plain.

在平地上看,群山突兀.

I noticed a slight frown of disapproval on his face.

我留意到他轻轻皱了一下眉,露出不赞成的样子.

There was a deep frown on his face when he was pondering a problem.

当他思考问题时,他双眉深锁.