The piston slides noiselessly up and down.

这个活塞上下活动，没有响声。

The old bus jogged up and down.

那辆旧公共汽车一上一下颠簸着行驶。

The tiger paced up and down the cage.

老虎在笼中走来走去。

He paced nervously up and down on the platform.

他在站台上情绪走来走去。

My relationship with him was very up and down.

跟他的关系忽冷忽热。

A little bird was bobbing its head up and down.

一只小鸟把头上下快速摆动着。

Window cleaners are pulled up and down tall buildings on cradles.

窗户清洁工乘坐能升降的吊篮清洗高层建筑物的窗子。

Prices have gone up and down like a seesaw this year.

今的价格像跷跷板一样时涨时跌。

It’s very hard to turn the wick up and down.

这灯芯很难旋上旋下。

He could not lie still, but rampaged up and down his bedroom.

他能静静躺着, 而在卧室里冲来撞去。

I walked up and down the aisle to stretch my cramped muscles.

在楼道里走来走去以舒展的肌肉。

On an oscilloscope, you can see an electrical current oscillate up and down.

在示波器上面你可以看到一股电流上下振动。

I’ve watched the ups and downs of his business with great interest.

怀着极大的兴趣关注着他事业的起起伏伏。

People up and down the country are giving money to the earthquake appeal.

全国上下的人都在为震捐钱。

You can scroll through the text using the up and down arrow keys.

你可以利用上下箭头键来翻看(计算机屏幕上的)整个文本。

She was jumping up and down.

她上上下下蹦着。

"The girls jump up and down together, cheering when the team has played well."

"球队表演出色时,女孩子们一齐跳上跳下为他们加油。"

Piscine on-line bobber is vibrating up and down, enrol all the way in water.

鱼线上的浮子正上下颤动，在水里一路一招。”

Reads slave tender Wind woolpack anger, ups and downs, runs more than several fame and fortune.

风卷云怒，正沉浮，奔走几多名利。

When I started working there, I could feel people looking me up and down and wondering what I was like.

刚到那里工作时，感觉到人们都在仔细打量，想知道是何许人也。