Through scaling transform, field F and energy level E are replaced by parameter t.

通过标度变换，引入t参量代替能级E和外电场F。

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It makes soils more acid since cations (e. g. potassium and magnesium) are replaced by hydrogen ions.

它能使土壤酸化，因为阳离子(如钾离子和镁离子)被氢离子所代替。

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Objective:To investigate the possibility of the E rosette assay in that human lymphocytes could be replaced by splenic cells derived from mice for experimental teaching.

目的：探讨以小鼠脾细胞代替人外周血淋巴细胞进行E玫瑰花结试验实验教学的可行性。

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And innovation will mean that activities within the stagnant sector, like hand-delivered post, can be replaced by alternatives where productivity improvements are more likely, like texts and e-mail.

FORBES: Why Health Care Will Just Keep Getting More Expensive