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重点讲解：
1. depend on 取决(于)；有赖(于)；
The risk and severity of sunburn depend on the body's natural skin colour.
晒伤的风险和严重程度取决于人体的自然肤色。
2. be based on 以……为基础；
The selection process is based on rigorous tests of competence and experience.
选拔过程是基于对能力和经验的严格测试。
3. make up 组成；构成；
Women officers make up 13 per cent of the police force.
女警占警力的13%。
4. lead to 招致；致使；导致；
This suggestion will certainly lead to an argument.
这个建议必将引起一场争论。
