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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。
Baroness Thatcher's claims seem credible to many.
撒切尔女男爵的主张在很多人看来是可信的。
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。
Nothing to be got without pains but poverty.
一份耕耘，一份收获。
This decree obliges unions to delay strikes.
该法令迫使工会推迟罢工。
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。
相关例句
As the nation continued to mourn, the new President of South Africa paid his own tribute.
举国仍在哀悼之际，南非新任总统也表达了自己的怀念之情。
Mexican healers use chocolate to treat bronchitis and insect bites.
墨西哥医生用巧克力医治支气管炎和蚊虫叮咬.
In all things, it is better to hope than to despair.
凡事抱希望为佳，不应悲观而失望。
I was too weak to move or think or speak...
我太虚弱了，无法动弹，无法思考，也无法说话。
The articles must flow in proper English while using the main keyword and LSI keywords.
流动的物品必须在适当的英语,而使用主关键字和LSI的关键字.
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。
An auctioneer,at the moment of non-sale,should be required to state plainly to his audience that an item has been bought in.
遇到无销路时,拍卖人必须向观众明确表示他已经买回自己送去的拍卖品。
He was ordered to appear the following day, but absconded...
他被传唤于第二天出庭，可是他逃跑了。
I never have to spell out my first name.
我从不需要将我的名拼读出来。
They bought an old schoolhouse to live in and built a workshop in the basement...
他们买了一处老校舍当住房，然后在地下室里建了一个作坊。