级差 meaning in English

gradation
stage head

Polite speech and gradation of communicative loss and benefit
礼貌语言和损益级差
They pay differential rents according to their income
他们根据收入多少付级差房租。
On the user study and relationship management of digital library
图书馆人力资源级差管理研究
Compare column - level differences
比较列级差异。
Analysis of differential distribution and contributing factors of henan shuyuan in qing dynasty
清代河南书院的分布级差与成因分析

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