预先计算 meaning in English

precomputation

Prepend to this
预先计算此
Around the point specified in the point parameter , and by prepending the rotation
参数中指定的点并通过预先计算该旋转，来顺时针旋转此
This method uses a pre - computed hash table to serve as an index for short sequences
这一方法利用一个预先计算的哈西表作为短序列的索引。
Pre - compute case condition and if then else conditions and jump into the right branch right away
预先计算case条件和if then else条件，并立即跳至适当的分支。
With this approach , you have to query only the pre - computed column to return the information that you need
使用此方法，只需查询该预先计算列即可返回所需的信息：

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