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...an exposure of 1/18sec at f/11...是什么意思？

...an exposure of 1/18sec at f/11...

1/18秒f/11光圈的曝光量

相关词汇
an exposure of at

an

art. 一（在元音字母前代替不定代词a），一任一某一，一个；
例句
He started eating an apple...
他开始吃苹果。

exposure

n. 暴露，揭发，公开，（商品等的）展出；
例句
Continuous exposure to sound above 80 decibels could be harmful.
持续暴露在强度高于80分贝的噪声中可能有害。

of

prep. 关于，属于…的，由…制成；aux. 助动词 [非标准用语、方言] =have [主用于虚拟语气]；
例句
He did have a real knowledge of the country...
他对该国的确知之甚多。

at

prep. （表示位置）在，在（某时间或时刻），以，达， 向，朝；n. 阿特（老挝辅币单位，100 阿特 = 1 基普）；
例句
Prices start at £13.95 a metre for printed cotton...
印花棉布以每米13.95英镑的价格起售。
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
Before you go near a stockbroker, do your homework.
找股票经纪人之前，先要做好必要的准备工作。
The view was that the economy would grow by 2.25 per cent. This would limit unemployment to around 2.5 million.
这一观点认为经济将会增长2.25%，这将把失业人数限定在250万左右。
...a very significant piece of legislation...
一条非常重要的法规
The jobs they offer pay peanuts.
他们提供的工作报酬很低。
...an eclipse of the sun.
日食
Examinations may be used to choose which pupils are to move into the top streams.
可以采取考试的方式来决定让哪些学生进入高阶班。
...a little village a few miles north of Portsmouth.
位于朴次茅斯以北几英里处的小村庄
The Front adopted an aggressive propaganda campaign against its rivals.
该阵线采用激进的宣传手段对付它的对手。
...ways to delay the settlement of debts.
延期清偿债务的办法
The tower is a relic of grim days when big houses had to be fortified against invaders...
这座塔是那些灰暗岁月的遗迹，那时大房子不得不被加固,以抵御侵略者。