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见，一个月之前他还听不见。
She isn’t rich, nor do I image that she ever will be. 她现在不富，我看她将来也富不了。
kick out 逐出、解雇、开除；意为“失去”
They kicked him out (of the club) for fighting.他因为斗殴而被开除（出俱乐部）。 something else 别的东西 take … on 接纳、承受
氯原子不能凭空获得一个电子，而钠原子也不能凭空失去一个电子，除非别的东西愿接受电子。
What happens when sodium come into contact with chlorine? The obvious. A chlorine atom removes an electron from a sodium atom.
come into contact 接触、相遇 The obvious 显而易见的
当钠与氯接触时发现了什么？很明显，氯原子从钠原子处拿走了一个电子。
The sodium ion and the chloride ion have electron arrangements (electron configurations) like those of two noble gases (neon and argon, respectively).
electron arrangement电子排布 electron configurations电子结构
钠离子和氯离子的电子排布（电子结构）就象两个惰性气体（氖和氩，相应的）一样。
Not only do the ions have stable octets of electrons, they also have opposite charges.
它们具有稳定的电子八耦体结构，而且有相反的电荷。 Everyone knows that opposites attract. 每个人都知道异性相吸。
While this rule of thumb may not always work when applied to people, it works quite well for cations and anions.
rule of thumb单凭经验来做的方法，比较粗糙的方法，约略得衡量（或估计）
虽然这种经验对人未必适用，但对阴阳离子是非常适用的。 The attractive force between oppositely charged ions is called an ionic bond, and the combination of sodium ions and chloride ions is the compound sodium chloride or table salt.
相反电荷之间的吸引力称为离子键，钠离子和氯离子结合为化合物氯化钠和食盐。
Covalent Bonds共价键
One might expect a hydrogen atom, with its one electron, to acquire another electron and assume the helium configuration. to acquire another electron and (to) assume the helium
configuration不定式做宾补
人们也许希望带有一个电子的氢原子，获得另一个电子并呈现氦的结构。
Indeed, hydrogen atom do just that in the presence of atoms of a reactive metal such as lithium, that is, a metal that finds it easy to give up an electron.
do代替上句, just that引导条件状语 reactive metal活泼金属 that is 插入语，也就是说 a metal，reactive metal的同位语， that引导定语从句修饰a metal
实际上，氢原子只有在活泼金属如锂的存在下确实发生了这样的反应，活泼金属就是很容易失去电子的金属。
But what if there are no other kinds of atoms around? 但是，如果周围没有其他种类的原子呢？
What if there are only hydrogen atoms (as in a sample of the pure element)?
如果只有氢原子（作为纯元素样品）呢？
One hydrogen atoms can scarcely grab an electrons from another, for among hydrogen atoms all have equal attraction for electrons (Even more important, perhaps, hydrogen atoms do not have a
tendency to lose electrons at all, for the result would be a highly reactive bare proton—— the hydrogen nucleus.) Even more important更重要的
一个氢原子几乎不能从另一个氢原子处获取电子，因为氢原子具有相同的电子吸引力（更重要的，可能是，氢原子没有失去电子的倾向，因为那样的结果是生成高度活泼的裸露质子——氢原子核）。
Still—— hydrogen wants a duet of electrons like helium’s. 而且——氢原子希望象氦原子那样拥有2个电子。
If one hydrogen cannot capture another’s electron, the two atoms can compromise by sharing their electrons.
如果一个氢原子不能获取另一个氢原子的电子，这两个原子则通过共用电子的方式解决。
It is as if the two hydrogen atoms, in approaching one another, get their electron clouds or orbitals so thoroughly enmeshed that they cannot easily pull them apart again. in approaching one another 做插入语
as if与as though 用法相同，意为：宛如、仿佛、好像。as if后面常用过去时表示现在，说明所作的比较“不是真的”。 You look as if you’d seen a ghost.
在非正式文体中，常用like代替as if。 He sat there smiling like it was his birthday.
就好像两个氢原子，当它们互相接近时，其电子云充分重叠，以至于难于再分开。
Moat of the time the electrons are located between the two nuclei.
大部分时间电子位于两个原子之间。
The electron-dot formula usually used, H:H, is therefore a fairly good picture (If we were to attribute human qualities to hydrogen atoms, we would suggest that they are a bit nearsighted. Each one looks around, sees two electrons, and decides that these electrons are its very own and that therefore it has as arrangement like that of helium, one of the noble gases.) electron-dot formula 电子式 noble gase惰性气体
经常用电子式H：H表示，这是一个很好的画面（如果我们以人的品性归于氢原子，我们说它们有些目光短浅。每个氢原子看看周围，看到两个电子，就认为这些电子是自己的，它们就有了象惰性气体氦那样的电子排布）。
This combination of hydrogen atoms is called a hydrogen molecule.
这种氢原子化合物叫氢分子。
Molecules are discrete groups of atoms held together by shared pairs of electrons. The bond formed by a shared pair of electrons is