1.
The isotope of uranium with mass number235, fissionable with slow neutrons.
锕铀铀的同位素，原子质量数为235，与慢中子发生裂变
2.
a uranium isotope with mass number 235; capable of sustaining chain reactions.
铀的同位素，原子质量数为，能进行持续的连锁反应。
3.
a radioactive isotope of strontium (with the mass number 90) that is present in the fallout from nuclear explosions; can be assimilated like calcium into bones.
锶的放射性同位素（原子质量数为），存在于核爆炸的原子尘中，能象钙一样被吸收到骨中。
4.
a radioactive isotope of cobalt with mass number 60; a source of exceptionally intense gamma rays; used in radiation therapy.
具有放射性的钴的同位素，原子质量数为，一种能量极高的伽马放射源，用于放射疗法。
5.
Any of two or more kinds of atoms having the same atomic mass but different atomic numbers.
同量异位素两种或各多种有相同原子质量但却有不同的原子序数的原子中的任一种
6.
The number of atoms in a molecule.
原子数，原子价，化合价单质分子中的原子数
7.
The mass of an electron is 1/1850 that of a hydrogen atom.
电子的质量是氢原子质量的1850分之一。
8.
the amount by which the mass of an atomic nucleus is less than the sum of the masses of its constituent particles.
原子核的质量总和比粒子的总质量少。
9.
A proton or a neutron has about the same mass as a hydrogen atom.
质子或中子的质量和氢原子的质量大致相同。
10.
One of two or more atoms having the same atomic number but different mass numbers.
同位素两个或更多具有相同原子序数却具有不同的质量数的原子中的一个
11.
Direct Mass Measurement for Short-lived Neutron-rich Nuclides;
短寿命丰中子原子核的直接质量测量
12.
The interstitial atoms of gold diffuse into silicon at a rate several orders of magnitude faster than the group III and V impurities.
金的填隙原子向硅扩散的速率比III族和v族杂质快几个数量级.
13.
Radiative Properties of an Accelerated Atom in Interaction with the Derivative of a Scalar Field in Minkowski Space-time;
闵氏时空中与标量场导数相耦合的加速原子的辐射性质
14.
atomic weight(also relative atomic mass) ratio between the mass of one atom of an element and one-twelfth of the weight of an atom of carbo
原子量（某元素的一个原子的质量与十二分之一的碳 原子量的比值）.
15.
the sum of the number of neutrons and protons in an atomic nucleus.
原子核中中子和质子数之和。
16.
The Quantitative Relation between Density of Solid Elemental Substance and Atomic Weight、Atomic Radius;
固体单质密度与原子半径和原子量的定量关系
17.
This method is used exclusively to measure masses of atomic particles.
这种方法专门用来测量原子的质量。
18.
Binding energy affects nuclear mass.
能量结合能影响原子核质量。