广泛的;大规模的,大量的 ③He asked for an extension of his visa. 他申请延长签证有效期。 ④The teacher had both extensive knowledge and profound scholarship. 这位老师的学问博大精深。 辨析 extend 表示“(时间、长度的)延长、延伸” 表示“展开(帆,翅膀等);使(尺寸、体积或范围)扩大” expa...