it-selfCOCA²²¹²⁸³ 基本例句 🌏它本体 But the orthogonal experimental method introduced by various publications was not unified, so that it makes people difficult to comprehend them, and interferes it-self to have further application. 然而各种书刊在正交试验的讲法上很不统一，造成人们理解上的困难，影响着正交试验法的进一步推广。 cnki