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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。
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。
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
The pedestrian stopped at the curbside.
那个行人停在路边。
Kane won the world title in 1938 when he outpointed Jackie Durich.
1938年，凯恩以点数击败杰基·杜里克，获得了世界拳王称号。
He clearly was still winding down from the excitement of meeting Stalin.
很显然,他还在从自己和斯大林会面的兴奋中逐步松驰下来.
I wish to change some pocket money.
我希望换些零钱。
The frail columns bear the architrave.
细弱的支柱支撑着框缘.
Historians looked to artists' representations of the lion to piece together a picture of how the lion once looked.
历史学家寄希望于艺术家对这位名人的描绘，以完整呈现他从前的模样。
His illustrative examples are almost invariably warmed over from other writings.
他举的例子几乎全是从别的著作中借用的.
I'm cheesed off with having to mow the lawn every week.
每个星期都得刈草坪真把我烦死了.
Castoreum Fragrance. Fragrances are an inexpensive way to perfume unscented hair products and Body Oils.
海狸香香油, 这款是使发部和身体散发香味的不贵的香油.
I had almost decided to keep my rendezvous with Tony.
我差不多已经决定如约和托尼见面了。