With a hash index you can find a record in a given file in constant time by generating a hash value for the record and then looking up the record in the file based on that hash value.

借助hash索引，可以通过为记录生成一个hash值，然后根据这个hash值在文件中查找该记录，从而在固定的时间内在给定的文件中找到一条记录。

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In the previous examples, the first column (i.e., the top manager) was specified as constant value.

在先前的示例中，第一个列(如总经理)被指定为常数值。

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An assign parameter mapping lets you specify a constant value to put in a target parameter.

赋值参数映射允许您指定一个常数值来放在目标参数中。

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And the constant, if we redo it in modern SI units, 1 would take on the value of 1.1 1*10^7m-1 times 10 to the 7th reciprocal meters.

如果我们用现代国际单位制来改写它，这个值是1,1。

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In addition to that, we have that epsilon nought value, remember that's the permittivity constant in a vacuum, and basically that is what we use as a conversion factor to get from units. We don't want namely coulombs to units, we want that will allow us to cancel out in this equation.

这是电子的电荷，此外，我们有epsilon零，记住这是真空的介电常数，这是我们用来转换单位的转换常数,我们不想用库伦单位，我们希望这个可以在方程中约去它。

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When the investments are depressed in value, the constant dollar amount buys more shares.

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