将下面改写学术一点In order to investigate the mechanism of technological catch-up between HIC and the upgrading of input-output efficiency the intermediary effect model is constructed as follows
To examine the mechanism of technological catch-up between high-income countries (HIC) and the improvement of input-output efficiency, we propose the construction of an intermediary effect model as follows:
原文地址: https://www.cveoy.top/t/topic/irHv 著作权归作者所有。请勿转载和采集!