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重点讲解：
1. build up （使）积聚；（使）逐渐增加；
Always using the same shampoo means that a residue can build up on the hair.
总是用同一种洗发水就意味着某种残留物会在头发上越积越多。
2. narrow down 缩减；压缩；减小；
What's happened is that the new results narrow down the possibilities.
现有的情况是，新的结果缩小了可能性的范围。
3. result in 导致；引起；造成；
Fifty per cent of road accidents result in head injuries.
50％的道路交通事故都会导致头部损伤。
4. be dependent on 取决（于…）的；有赖（于…）的；
The local economy is overwhelmingly dependent on oil and gas extraction.
当地经济过于依赖石油和天然气的开采。
