Example 1 - Historical Rates with only two roll ups.
示例1—只有两个汇总(roll ups)的历史汇率。
This is a simple case with only two possible energies.
在这个简单的例子中只有两种可能的能量。
It has only one table, Customers, with only two entries in it.
该数据库只有一张表Customers,该表中只有两个条目。
And,all cooking in the kitchen is done with only two hot water boilers for pasta and a wood-burning oven.
VOA: special.2009.04.10
We could also figure out the formal charges, and obviously the formal charges between these two atoms, they're going to be identical, we're only dealing with oxygen atoms here.
我们还可以把形式电荷算出来,显然这两个原子的形式电荷,应该是完全相同的,我们要处理的只有氧这一种原子。
There are some exceptions, which we'll get to later, but the only a big exception here is with hydrogen, which has a special stability that's associated with two electrons.
但也有一些例外我们将以后再讲,但这里只有一个较大的例外,氢,它的稳定性比较特殊,只需要两个电子。
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