1. The symptoms of Parkinson's differ from person to person. They also differ in their intensity.

differ from与…不同

例句：She differs from her sister in the color of her eyes.
      她与她姐姐眼睛的颜色不同。

      She differs from her brother in character.
      她与她哥哥性格不同。
 
2.They produce reactions in the nerve cells in the brain. They can be given alone or in combination with levodopa.

in combination with与…联合, 与…结合

例句：He carried on the business in combination with his friends.
      他与朋友们合伙做生意。

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