雅思写作常用词汇：变化/不同

　　vary/change/differ/alter;

　　various/diverse;

　　variety/diversity;

　　variation/change/alteration;

　　variable/changeable/unstable/fluctuating/shifting/wavering/uneven;

　　variable变量;variably易变地;

　　upward/uphill/rising/climbing上升的