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重点讲解：
1. a piece of 一张；一片；
He handed her a piece of paper certifying she was in good health
他递给她一份她的健康证明书。
2. dependent on 依赖于；依靠于；
You can't be dependent on your parents all your life.
你不可能一辈子靠父母生活。
3. be open to 对……开放；向……开放 ；
The show will be open to the public at 2pm; admission will be 50p.
演出下午两点开始，入场费50便士。
4. expand to 扩大为；扩展到；
The plan is to expand to 300,000.
他们的计划是扩充到30万人。
