原子核的

A nucleus is about one billionth the size of an atom.

原子核的大小约为原子的十亿分之一。

A nucleus is about one tho北美nd billionth the size of an atom .

原子核的体积大约是原子的一千兆分之一。

He spent the next three years there working with Professors Van Vleck and Bridgman on problems in cohesion and electrical conduction in metals and also did some work on the level density of nuclei.

他又在那里和范弗勒克教授和布里奇曼教授工作了3年，研究金属的内聚性和电子传导，也做了一些原子核的水平密度研究。

Mainly use the -235 uranium or plutonium -239 and other heavy nuclei fission chain reaction mechanism made of nuclear weapons, known as fission weapons, or atomic bomb.

主要利用铀－235或钚－239等重原子核的链式裂变反应原理制成的核武器，叫做裂变武器，或称原子弹。

The first term in the Hamiltonian is the sum of the

电子哈密顿量是量子力学中的一个算符，它描述多原子分子中电子和原子核的运动。

Changes can occur in the structure of the nuclei of atoms.

生产变化可能发生在原子的原子核的结构。

The main source of energy in the universe is the fusion of atomic nuclei.

宇宙中能量的主要来源就是原子核的聚变。

A second method watches for another effect of the recoiling nucleus: ionization.

探测器使用的第二种方法，是观察反冲原子核的另一种效应：游离。

However, even the atomic number as high as 94, there is no stable nuclei are the same elements found in nature, and this is the natural decay of uranium and thorium.

可是，即使是原子序数高达94，没有稳定原子核的元素都一样能在自然中找到，这就是铀和钍的自然衰变。

Then they placed an extremely thin layer of silicon dioxide — about two billionths of a meter thick — onto the silicon between the gold contacts.

这样，磷原子核的自旋可以在二氧化硅的表面被检测到。

Breath, muscle contraction of the buttocks; arch body, as far as possible to hold his head, right leg straight towards the ceiling (peg-leg knee in order to avoid muscle tension).

呼气，收缩臀部肌肉；拱起身体，尽量抬起头来，右腿伸直朝向天花板（膝微屈，以避免肌肉紧张）。

The cost of moving grain food products was unchanged from May, but year over year are up 8%.

粮食产品的运输费用与5月份相比没有变化，但却比去年同期高8％。