Technetium-99, a fission product of nuclear reactors that emits gamma rays, is the most-used tracer isotope in nuclear medicine. Technetium resembles platinum in appearance and manganese and rhenium in chemical behaviour. It is also used as a metallurgical tracer and in corrosion-resistant products.

鎝-99是核反应堆的裂变产物，是原子核医学中最有用的同位素。鎝在外观上像铂，而化学行为像锰和铼。鎝在冶金上用作示踪剂，还用于低温化学以及抗腐蚀产品中。

When heated to incandescence in the furnace of stars,each element marks the spectrum of light it emits with a characteristic set of lines(Malcolm W.Browne.

当在众多星状物组成的熔炉中被加热到白热程度时，每一个元素都以其特有的一组谱线显示出它所放出的光谱(马尔科姆W.布朗)。

Electrode: A device that emits or controls the flow of electricity.

电极:发出或控制电力流动的装置。

An influence on a post-synaptic neuron which enhances the probability that the neuron emits a spike.

对突触后神经元的一种影响，它增强神经元发放冲动的概率。

Light-emitted diode (LED): A semiconductor diode which emits light when a voltage is applied. Commonly used in its short form: LED.

发光二极管:感受电压而发射光线的半导体二极管。

Boiling water emits stream.

沸水冒出蒸汽

boiling water emits steam

沸腾的水放出蒸汽。

The pigment cobalt blue has a variable composition, roughly that of cobalt oxide plus alumina. A radioactive isotope of cobalt emits penetrating gamma rays that are used in radiation therapy.

钴蓝含有各种不同成分，大致是由氧化钴和氧化铝构成。人工放射性同位素钴-60的γ射线可用作放射性医疗;曾有人建议用钴的另一种放射性同位素来制造钴弹，但从未发展。

Photocell: or photoelectric cell, or electric eye; Solid-state device with a photosensitive cathode that emits electrons when illuminated and an anode for collecting the emitted electrons.

光电管:一种固体探测器，有一个对光灵敏的阴极，受到光照时能发射电子，还有一个用于收集所发射电子的阳极。

A volcano emits smoke, lava and ashes.

火山喷出烟、熔岩和灰烬。

A volcano emits smoke,lava and ashes.

火山喷射出烟、熔岩和灰烬.

A volcano emits smoke and ashes

火山散发着烟和灰。

An engine emits smoke from its funnel into the air.

机车通过烟囱把烟排入空气里。

A large whip scorpion(Mastigoproctus giganteus)of the southern United States and Mexico that emits a strong odor of vinegar when disturbed.

巨鞭蝎一种大型鞭蝎(鞭蝎)，产于美国南部和墨西哥，在受骚扰时发出一种强烈的醋酸味

Cole often emits a loud sneeze.

科尔常常大声打喷嚏。

The unit of brightness in the centimeter-gram-second system,equivalent to the brightness of a perfectly diffusing surface that emits or reflects one lumen per square centimeter.

朗伯在厘米-克-秒制中的一种亮度单位，相当于完全漫射的表面上辐射或反射1流明每平方厘米的亮度

A starlike object that has a large red shift and emits powerful blue light and often radio waves.

类星体一种类似星体的物体，它有很大的红移并放射出大量的蓝光，而且经常还有无线电波

The sun emits light.

太阳发出光。

The sun emits light and heat

太阳放射出光和热。

A substance that emits and diffuses a fragrant odor,especially a volatile liquid distilled from flowers or prepared synthetically.

香水一种可以散发香味的物质，尤指从花瓣中提取的液体或合成物质

A flashbulb located in one end of the box emits a burst of light of energy E

箱内的一端有一盏闪光灯，它射出一个能量为E的闪光。

The trunk of the rubber tree emits drops of liquid rubber.

橡胶树的树干流出一滴滴液状橡胶。

A radio transmitter that emits a characteristic guidance signal for aircraft.

一种向飞机发送特殊导航信号的无线电传送装置。

He emits , along with a hint of expensive aftershave, the composure of success

在散发出高档剃须润肤水那幽微香气的同时，他透出成功者特有的沉着镇定。

That viewer is a specialised zero-power display made of a water-proof bi-stable LCD material that emits reflective light only, allowing adjustment for night-vision goggles and high readability in bright sunlight

这是一种特制的零功率显示器，由防水的双稳态液晶显示材料制成，这种材料只发射反射光，可调节成既适于夜视镜要求又适于强阳光下的高清晰度要求。

The machine emits sound pulses.

这台机器可发出声脉冲信号.

Is it possible that this substance,spontaneously and without any previous excitation,emits some invisible,highly penetrating radiation that can pass without difficulty through the cover of the box and the black paper and affect the photographic emulsion?

这种物质能否自然地，未经事先激发就发射出某种肉眼看不见但穿透力很强，能轻易地穿透盒子的外壳及黑纸与感光乳剂发生作用的射线呢

The liquid emits a terrible smell

这种液体散发出非常难闻的气味。

A hollow metal instrument, usually cup-shaped with a flared opening, that emits a metallic tone when struck.

钟一种中空的金属乐器，通常呈杯状带喇叭式外张口，敲击时可发出金属的音质

The he-Cd laser, which is a recent arrival on the scene, emits at 325.0 nm and 441.6 nm

最近出现的he―Cd激光器在325．0纳米和441．6纳米的波长上发射。