A methyl group is a basic unit in organic chemistry: one carbon atom attached to three hydrogen atoms.
甲基是有机化学的基本单位：一个碳原子连接三个氢原子。
An atom is the smallest characteristic unit of an element.
原子是元素最小的结构单位。
Deuteron: the nucleus of a deuterium atom consisting of a proton and a neutron regarded as a subatomic particle with unit positive charge.
氘核：氘原子的原子核，由一个质子和一个中子组成，被视为带单位正电荷的亚原子。
An atom is the smallest indivisible unit of matter.
原子是最小的不可分割的物质单位。
Atom: Smallest unit into which matter can be divided and still retain the characteristic properties of an element.
原子：元素的特征性质保持不变的最小物质单元，也是在不释放带电粒子的情况下物质能够分割的最小单元。
Moreover, diffusing thickness in unit time of active atom tin increased with the temperature firstly and then decreased with the time at the same temperature.
而单位时间内锡原子扩散厚度随温度升高增长较快，同一温度下单位时间内锡原子扩散层随时间增加呈现先增加后减小的趋势。
Small as they are, atom is made up of still smaller unit know as subatomic particle .
原子虽小，但它们是由更小的称为亚原子粒的单位组成的。
Small as they are, atom is made up of still smaller unit know as subatomic particle.
原子虽小，但它们是由更小的称为亚原子粒的单位组成的。
The fluorescent tuning on and off can be achieved by the stimuli of acid, which will protonate the central nitrogen atom of triphenylamine unit to stop the PIET process.
通过加入酸将三苯胺中心氮原子进行质子化，切断其PIET过程，可实现荧光的淬灭与恢复的可逆性荧光调控。
As the atom is the unit particle for elements, so the molecule forms an indivisible unit for compounds.
犹如原子是元素的基本单元粒子同样，份子形成为了化合物的1个最小单元。
The atom is a basic unit of matter consisting of a dense, central nucleus surrounded by a cloud of negatively charged electrons.
原子是物质的基本单位组成了一个密集，中央核周围有云带负电荷的电子。
To solve ERP system standardization problems, the research strategy based on atom-unit is discussed.
为解决ERP系统标准化问题，提出了基于原子单元的ERP系统标准化研究策略。
To solve ERP system standardization problems, the research strategy based on atom-unit is discussed.
为解决ERP系统标准化问题，提出了基于原子单元的ERP系统标准化研究策略。
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