It is not a simple arithmetic mean.
它并不是简单的算术平均。
Who can solve this simple arithmetic problem?
谁会做这道简单的算术题？
The arithmetic is simple and effective, and is realized easily.
该算法简单有效，容易实现。
The little boy can already do simple problems in arithmetic.
那个小男孩已经能做简单的算术题了。
The little boy can already do simple problems in arithmetic.
那个小男孩已经能做简单的算术题了。
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