重点讲解：
1. compared to 与…相比；和…比起来；
例句：Columbia was a young city compared to venerable Charleston.
与历史悠久的查尔斯顿相比，哥伦比亚是个年轻的城市。
2. ahead of 早于；在…之前；
例句：Firstly comes a gradual change in water level, the forerunner, a few hours ahead of the storm's arrival.
首先出现水位的逐渐变化，这是风暴到达前几小时的先兆。
3. account for （数量或比例上）占；
例句：In addition, the breaching party shall pay to the other party a fine, which shall account for 15% of the total amount involved.
此外，违约方须向另一方支付一笔罚金，其金额占违约金额的15%。
4. carry out 实施；执行；实行；
例句：They were carrying out the plan behind the curtain.
他们在秘密地实行那个计划。
5. intend to do sth. 想要；打算；计划；
例句：For the future I intend to look after myself.
今后我想多替自己打算打算。
