For example, during past ice ages, glaciers advanced down through North America and Europe and gradually cut off parts of populations from one another.advanced down在这里是什么意思?
home用作副词时,最通常连用的介词是at。如:Jane works at home. 简在家工作。 He found it impossible to study at home. 他觉得不可能在家学习。If it rained tomorrow, we’d stay at home. 如果明天下雨,我们将待在家里。除at外,home还可连用哪些介...