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重点讲解：
1. find out (尤指特意通过努力)发现，找出，查明；
She made it her business to find out who was responsible.
她一定要查清楚到底该谁负责。
2. 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。
3. respond to 应对；作出回应；作出反应；
The animals were conditioned to respond to auditory stimuli.
经过训练，那些动物对声音形成了条件反射。
4. rely on 依赖；依靠；
These days we rely heavily on computers to organize our work.
现在，我们在很大程度上依赖电脑来安排我们的工作。
n. 罐头，锡，听头
adj. 锡制的
