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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。
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
He was beginning to understand the seriousness of life.
他渐渐地懂得了生活的严肃性。
The radio was blaring out rock music.
收音机播放着吵闹的摇滾乐。
What happened to that woman in afterlife?
那女人后半生的生活怎样？
Yet few world-class rivers anywhere have etched a more enduring impression on as many millions for as many years.
然而,世界上很少有这样大的河流会给这样多的人留下这样长时间的令人难忘的印象。
the nasal opening
鼻孔
The actress was so absent-minded that she fluffed her lines.
那位女演员心不在焉竟然忘了台词。
a rubbery substance
橡胶物质
I shall certainly be present at the meeting, but I am not sure about my wife.
我肯定会出席会议, 但是至于我的妻子去不去我就不敢说了。
She was dressed in the latest fashion.
她穿着最新时装。
Is this contract valid?
这份合同有法律效力吗?