1、 To accurate the investigation of its effect, passage sight vocabulary was treated as a covariate in the study.
为了更加准确地研究其影响，本研究还将另一语言因素，篇章视觉词汇量作为协变量纳入探讨范围内。
来源:互联网
2、 Estimation of Parameters of a Linear Regression Model under Interval-censored Covariate
协变量区间删失时线性模型的参数估计
来源:互联网
文