for the residue

例句：

1. 1. The food had a lot of residue on it.
   食物上有很多残留物。
2. 2. The chemical residue in the air is dangerous for people's health.
   空气中的化学物质残留对人们的健康有害。
3. 3.The leftovers from the dinner were still warm.
   晚餐剩下的东西仍然很热。