Reactants become products and that's that.

反应物变成产物，仅此而已。

But how does the leaf prevent unwanted intruders, like bacteria from getting in and stop important reactants from escaping?

但是，叶子要如何防止不必要入侵者（如细菌）进入并阻止重要反应物逸出？

Below that is the spongy mesophyll, which have plenty of space in between them for reactants to move through.

下面是海绵状中叶，它们之间有空间供反应物移动通过。

So over here on the left-hand side we have the reactants.

所以在左侧里我们有反应物。

So here we have the reactants.

所以里有反应物。

The products are also breaking back apart into the reactants.

产物也分解成反应物。

And so what are the reactants here?

那么里反应物是什么？

If I raise the temperature, it's like adding a reactant so the reaction will proceed to the right.

如果我提高温度， 就好像添加了一种反应物， 样反应就会向右进行。

If you actually provide more reactants, you're gonna go more in that direction.

如果你真提供了更多反应物，你就会朝着那个方向走得更多。

That was one of our reactants and it dissolves readily in water, hence the oceans.

那是我们反应物之一， 它很容易溶解在水中， 因此很容易溶解在海洋中。

More ammonia molecules are available to break up into the reactant gases.

更多氨分子可用于分解成反应气体。

One particular ratio of reactants to products where the products form at the same rate that they break down.

一种特定反应物与产物比例， 其中产物形成速率与它们分解速率相同。

But sometimes, there's an opposite reaction that occurs with the products changing back into the reactants.

但有时，随着产物变回反应物， 会发生相反反应。

So again, it's the product of the products of the product of the reactants and the coefficients become exponents.

同样，它是反应物乘积乘积， 系数变成指数。

Then, plug in the number of moles for each of our products and reactants.

然后，为我们每种产品和反应物插入摩尔数。

Reconciling the reactants with the products is called equation balancing, and it's a good bit of what stoichiometry is all about.

将反应物与产物调和称为方程式平衡，很好地说明了化学计量学全部内容。

The capital letters stand for the reactants and the products and the lowercase letters stand for their coefficients.

大写字母代表反应物和产物，小写字母代表它们系数。

That's why reactants like this are written with a double arrow, indicating that the process runs both directions.

就是为什么像样反应物用双箭头书写， 表明该过程是双向进行。

A leaf is like a plant's food factory — and its parts work together to get the reactants into one place so that photosynthesis can happen.

叶子就像植物食品工厂——它各个部分一起工作，把反应物带到一个地方，样就可以进行光作用。

But what if you don't know the standard free energies of formation for the products and reactants?

但是，如果您不知道产物和反应物标准生成自由能怎么办？