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重点讲解：
1. cut back 减少；削减；缩减；
We had to cut back production.
我们只得减产。
2. come in contact with 接触；
Farm workers frequently come in contact with these insecticides.
农场工人常常接触这些杀虫剂。
3. be free of 无…的；摆脱了…的；
She retains her slim figure and is free of wrinkles.
她保持着苗条的身材，脸上也没有皱纹。
4. lead to 招致；致使；导致；
This can lead to bodily weakness and muscle wastage.
这样可能会导致身体虚弱和肌肉萎缩。
