副作用

例句：

1. 1. This medicine has a common side effect of nausea.
   这种药有一个常见的副作用是恶心。
2. 2. The surgery had several potential side effects that needed to be monitored.
   手术有几种潜在的副作用，需要监测。
3. 3. The new drug may have undesirable side effects.
   这种新药可能会有不期望的副作用。