LefkovitsCOCA²⁰²¹⁹⁸ 基本例句 莱夫科维奇¹⁰⁰ “ While this is an interesting concept that has been explored before, it will take years of extensive testing to determine whether this will be a worthwhile prevention method,” Lefkovits said. “虽然这是一个有趣想法,并且得到研究,但是这需要多年时间来广发测试,才能确定这是不是一个有价值的预防方法。” Lefkovits说。 yeeyan