The ratio of those causing fission to those escaping increases as the mass of uranium-235 increases.

It is necessary to enrich the fuel by increasing the percentage concentration of uranium-235.

必须提高铀235浓度的百分比,使燃料浓集.

Let us test Kepler's third law for the orbit of uranus compared with that of earth.

让我们比较天王星和地球的轨道,来检验一下开普勒第三定律.

Can I have a look at Uranus too, Lavender? said Ron.

‘可以把天王星也让我看一眼吗,拉文德? ’罗恩说.

There is an opposition formed between Venus and Uranus in your chart.

在你的命盘中,金星跟天王星之间形成对分相.

There are 15 moons and 11 rings surrounding Uranus.

它有15颗卫星以及11个环绕该星球的光环.

Uranus however is heating up and melting her icy surface.

不过天王星正在升温并溶化表面的冰层.

However, Neptune does not turn on its side the way Uranus does.

然而, 海王星不像天王星那样朝一边倾斜旋转.

New discoveries about Uranus excited planetary astronomers in 1977.

一九七七年对天王星的几项新发现振奋了行星天文学家.

Moluranite is a mineral of uranyl molybdate group.

多水钼铀矿属铀酰钼酸盐类矿物.

At any rate, the separation ratio is urate.

无论如何, 这个分散比是精确的.

urban areas

城镇地区

Most of the population is an urban population...

绝大多数人口都是城镇居民。

urban life

城市生活

The government is spending billions of dollars on new urban rail projects.

政府正把数十亿元花在新城市铁路项目上。

Waits sang about the boozy netherworld of urban America.

韦茨歌唱美国都市纵酒豪饮的下层世界。

Most urban areas are close to a park.

绝大多数城区附近都有公园。

urban development (= the process of building towns and cities or making them larger)

城市发展

efforts to control urban sprawl (= the spread of city buildings into the countryside)

控制城市扩展的努力

urban renewal/regeneration (= the process of improving the buildings, etc. in the poor parts of a town or city)

城市环境更新

the deprived sections of the urban population

城市人口中的贫困群体