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concave lens是什么意思？

concave lens

凹透镜

相关词汇
concave lens

concave

n. 凹面，成凹形；adj. 凹的；vt. 使成凹形；

lens

n. 透镜，镜头，眼睛中的水晶体，隐形眼镜，汽车的灯玻璃；
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
It is hard to compare.
很难比较。
A chemist can separate a medicine into its components.
化学家能把一种药物的各种成分分解出来。
My dear compatriot, it is time that we did something for our country.
亲爱的同胞们，为国效劳的时候到了。
I heard he ask her to compose herself.
我听到他叫她镇定。
Certain desires are common to all men.
某些欲望对所有的人是共有的。
We have a very amiable companionship.
我们之间存在一种友好的关系。
His eyes were strangely compelling.
他的眼睛有一种奇特的吸引力。
A fire is comparable with the sun; both give light and heat.
火可以和太阳相比, 两者都可以发光发热。
The car ran out of petrol, and as a further complication I had no money!
汽车没油了, 更麻烦的是我身上没有钱！
Complacency could easily result in tragedy.
自满容易道致悲剧。
She ran away from her husband to join a women’s commune.
她逃离了丈夫, 加入了一个妇女公社。
The minister appealed to the Cabinet not to target her comparatively tiny budget of ￡4 billion.
那位部长呼吁内阁不要以她40 亿英镑这样相对小额的预算为批评目标。
He is the chairman of the commonwealth of artists.
他是艺术家协会的主席。
U.S.business today is challenged by aggressive overseas competitors.
今天的美国商业受到咄咄逼人的外国竞争者的挑战。