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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；
例句
In adults its contour may be straight, slightly concave or slightly convex.
成人肺其形状可以是直的, 轻微凹下或轻度突出.

lens

n. 透镜，镜头，眼睛中的水晶体，隐形眼镜，汽车的灯玻璃；
例句
The camera has a 32mm lens with a maximum aperture of f/4.5 and a fixed shutter speed of 1/100sec.
这架相机有一个32毫米的镜头，最大孔径为f/4.5，固定快门速度为1/100秒。
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
Traffic thins noticeably after 9 a.m.
早上9 点之后，车流量明显减少。
I can’t read it if it’s upside-down.
若把它上下翻转过来,我便看不懂了。
The army reformed.
军队重新改编了。
The cross-references refer you to information in other parts of the dictionary.
互见引导你在词典的其他部分寻找信息。
an incorruptible judge
廉洁的法官
This task is accomplished by great effort.
这项任务是经过巨大努力才完成的。
The cabinet are agreed by the Prime Minister.
内阁成员和首相的意见一致。
The questions he raised are of first-rate importance.
他提出的问题至关重要。
Don't all speak together.
不要都同时说话。
The police finally cornered the thief.
警察终于把那个小偷逼入一个角落。