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Levers and pulleys are simple machines.是什么意思？

Levers and pulleys are simple machines.

杠杆和滑轮是简单机械.

相关词汇
levers and pulleys are simple machines

levers

n. <物>杠杆( lever的名词复数 )，操作杆，施压的行为；
例句
Figure 10 - 8 : Ejector seat levers have catastrophic results.
图10-8弹射操纵杆具有灾难般的后果.

and

conj. 和，与，而且，于是，然后，因此；
例句
I spend a lot on expensive jewelry and clothing...
我花很多钱购买昂贵的首饰和衣服。

pulleys

n. 滑轮（组），滑车( pulley的名词复数 )，皮带轮；
例句
Levers and pulleys are simple machines.
杠杆和滑轮是简单机械.

are

vi. （用于第二人称单复数现在时，第一、三人称复数现在时）是；n. 公亩（等于100平方米）；
例句
We are scared to abandon ourselves to our feelings in case we seem weak or out of control.
我们不敢放纵自己的情感，以免显得太过软弱或缺乏自制。

simple

adj. 简单的，单纯的，易受骗的，天真的；n. 笨蛋，愚蠢的行为，出身低微者；
例句
The older child should be able to prepare a simple meal...
那个年纪稍大的孩子应当会做一顿简单的饭菜。

machines

n. 机器( machine的名词复数 )，机械装置，机动车辆，飞机；
例句
...13 year-olds spending their pocket money on fruit machines in arcades.
将零花钱花在游戏机室中水果盘老虎机上的13岁的少年们
热门例句
He acknowledged publicly that he might have made a mistake.
他当众承认自己可能犯了个错误。
...the spiralling vortex airflow that slows the plane.
使飞机减速的螺旋形气流涡旋
You just go on ahead. I'll come by later...
你只管先往前走。我随后就来。
He who spares his rod hates his son, But he who loves him chastens him early.
24不忍用杖打儿子的,是恨恶他;疼爱儿子的, 趁早管教.
For further information, please contact 414 3925, extension 2253.
详情请致电414 3925,转分机2253。
He sat there while I made the case for his dismissal...
他坐在那儿，听我陈述解雇他的理由。
This decree obliges unions to delay strikes.
该法令迫使工会推迟罢工。
Nothing to be got without pains but poverty.
一份耕耘，一份收获。
The right to demand payment from the endorser of a commercial paper when the first party liable fails to pay.
追索权当有支付义务的第一方不能支付时，可以向商业票据的背书人要求支付的权力。
Supporters of the death penalty argue that it would deter criminals from carrying guns...
死刑的支持者认为它能阻吓罪犯携带枪支。
相关例句
Winter takes its toll on your health.
冬天对健康不利。
'Did I wake you?' — 'Yes, but it doesn't matter.'
“我把你吵醒了？”——“是的，不过没关系。”
Forgive me, I don't mean to insult you.
请原谅，我并非有意侮辱你。
They are raking in the profits from each more audaciously violent movie.
通过一部部更加大胆的暴力电影，他们攫取了巨额利润。
Stop sapping her confidence!
别动摇她的信心!
Both horse and rider were dripping with sweat within five minutes...
没过五分钟，马和骑手都大汗淋漓。
She herself told me the news.
这个消息是她亲自告诉我的。
I lathered my face and started to shave.
我往脸上涂了皂沫，然后开始刮胡子。
Holyfield has bulked up to 210 pounds using weights.
霍利菲尔德体重增到了210磅。
This DVD player reproduces the sound of the piano very well.
这部DVD播放机能够很好地再现钢琴的声音.