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R×C （R+C）-1 R×C-1 （R-1）×（C-1）
百分比收益率（R）=（P1+D-P0）÷P0×100％ 百分比收益率（R）=（P1-D-P0）÷P0×100％ 百分比收益率（R）=（P1+D+P0）÷P0×100％ 百分比收益率（R）=（P1-D+P0）÷P0×100％
to doing for doing in doing to do
A. to save save saving to be save
to do, as do, as doing, as doing, like
explore explored that explore to exploring
required chosen influenced explained
to doing for doing in doing to do
that; to save whatever; to save what; save the thing; save
women scientist woman scientist woman scientists women scientists
by doing experiments by means of his own careful observation by using the work of other scientists by chance
had done do are doing will have done
to do for doing in doing to doing
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