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重点讲解：
1. on fire 着火；起火；在燃烧；
The captain radioed that the ship was on fire.
船长发无线电说船着火了。
2. on average 平均起来；按平均值；
On average each report requires 1,000 hours to prepare.
准备一份报告平均需要1,000小时。
3. in turn 继而；转而；反过来；
Increased production will, in turn, lead to increased profits.
增加生产会继而增加利润。
4. heat up 变热；
In the summer her mobile home heats up like an oven.
夏天一到，她的活动住房就变得像烤炉一样热。
