In none of these respects does optical astronomy have any advantage over radio astronomy.

The mass of one of these suppressive black holes has recently been measured using radio astronomy.

对于这些有着巨大质量的黑洞,最近可利用射电天文学来测量它们的质量.

Radium , because of its powerful radioactive rays, can go deep into the human body.

镭因为它有强大的放射性线, 能够穿透人们的身体.

How many radioactive elements do you know?

你知道多少种放射性元素?

People should keep away from the radioactive waste.

人们应远离放射性废物.

It looked like ordinary salt, but was one million times more radioactive than uranium.

看起来它就像普通的盐, 而它的放射性却比铀要大一百万倍.

a rise in the level of radioactivity

辐射强度的增加

For underwater bursts at certain depths, the radioactive cloud may not be formed.

当在水下某一深度爆炸时, 放射性云团也许不会形成.

[不可数名词]the study of radioactivity

放射性研究

Honeycomb sandwich has become an important material in designing radomes instruction.

蜂窝夹层结构已成为雷达罩结构设计中广泛应用的重要材料.

Both items instead have radomes, suggesting they might be active radar-guided weapons like the SD-10.

两个项目改为有天线罩, 它们可能是像SD-10一样的主动雷达 - 制导武器.

B-RAF-siRNA inhibited BGC 823 cell prolifera-tion and induced apoptosis ( P & lt; 0.01 ).

促进胃癌BGC823细胞的凋亡 ( P & lt; 0.01 ).

He was an RAF pilot.

他是皇家空军飞行员。

RAF pilots were the heroes of the Battle of Britain.

英国皇家空军是不列颠战役中的英雄.

An old proverb says From rags to riches and back again in three generations.

有句古谚语这样说:“富不过三代. ”

We went from rags to riches overnight.

我们在一夜之间由贫致富.

She is our role model whose life a rags-to-riches story.

她是我们的榜样,她的一生白手起家,靠自我获得成功.

He is to marry a multimillionaires in the rags-to-riches wedding of the year.

他打算在今年的一夜成巨富的婚礼中取一位亿万女富翁.

If I bought this stock, i would be from rags to riches.

如果我买了这只股票, 我就会发大财.

Hers was a rags-to-riches story.

她的经历可谓白手起家.

His is certainly a rags-to-riches tale.

佩尔穆特的故事当然是由赤贫到巨富.