各种物质，不论它是什么，都是由一些称为分子的很小的粒子构成的。
Every substance, no matter what it is, is composed of very small particles called molecules.
如果你有高血压，那么当你减少饮酒量时，可以使心脏收缩压有很小但又有意义的下降，可以下降2- 4毫米汞柱(上面的数即分子数值)，以及心脏舒张压下降1 - 2毫米汞柱(下面的数即分母数值)。
If you have high blood pressure, cutting back on booze could produce a small but significant drop of 2 to 4 mm Hg systolic (the top number) and 1 to 2 mm Hg diastolic (the bottom number).
如果我改变,得到我感兴趣的分子，或许就没有酸性的那一部分，但是仍然会考虑pH的影响或许很小。
pH And if I change the pH and I've got a molecule that I'm interested in, it may not have an acidic moiety on it, but it could still care what the pH is, slightly.
酒精是种很小的分子。它很容易就能穿过你身体里的细胞膜。
Alcohol is a very small molecule that can cross the membranes of your body's cells quite easily.
例如，我们可以模拟，在一个平面很小的一部分上大约有100个水分子，或者在一个有着很明确的缺陷的表面。
For instance, we can model a few hundred water molecules on a small segment of a flat surface or a surface with some very well-defined defects.
摩尔体积发生了很小的改变，如果你试图使气体分子间相互碰撞，他们不能占据同一个位置。
The molar volume is being changed a little bit trying to make things collide with each other, they can't occupy the same volume.
我们必须断定当分子间距离很小时，就存在互相排斥的力量。
We must conclude that when the distance between the molecules is very small, there are forces of repulsion.
但这只说明了分子电脑可能对人类生活产生影响的很小一个方面。
But that says very little about the potentially life-changing effects of molecular-scale computers.
单原子或者分子，由很多很小的原子组成。
We have either single atoms or molecules consisting of small numbers of atoms.
这个尺寸只有人类头发宽度的千分之一，以日常生活经验来说算很小，但以原子及分子的尺度来说却很大。
This size is tiny by the standards of everyday experience—about one thousandth the width of a human hair—but it is large on the scale of atoms and molecules.
这个尺寸只有人类头发宽度的千分之一，以日常生活经验来说算很小，但以原子及分子的尺度来说却很大。
This size is tiny by the standards of everyday experience—about one thousandth the width of a human hair—but it is large on the scale of atoms and molecules.
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