from to between .and during and at the start of by the end of over

at the end of throughout

时间’s + 具体数据 上升和下降趋势的组合描述： 1. 先上升后下降的句型：

...... increased slowly during and but fell sharply in .

A steady fall in during and followed the sharp increase in .

2. 先下降后上升的句型：

fell before began to make a recovery continue the recovery， climbing to dropped during but increased again in fell and then pick up during

collapsed before rising to at the end of

3. 起伏波动的句型：

fluctuated sharply all through

4. 波动不大的句型：

hardly changed through the period between and

柱状图形的描述 转换为线形图形的描述 饼状图形的描述