To estimate more accurately the electron correlation effects, one has to calculate to higher orders and check he convergency of the series.
要准确计及电子相关效应，还需通过作更高阶展开，以考察级数的收敛性。
To estimate more accurately the electron correlation effects, one has to calculate to higher orders and check he convergency of the series.
要准确计及电子相关效应，还需通过作更高阶展开，以考察级数的收敛性。
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