recover
1.下面四句意思不同：
- He recovered.（他复原了。）
- He had recovered.（他已经复原了。）
- He was recovered.（他已经在复原的状态中了。）
- He was recovering.（他正在复原中［尚未复原］。）
2.下面四句都作“他已经复原了”解，但第四句不很普通。
- He has recovered.
- He has recovered his health.
- He has recovered from his illness.
- He has recovered his illness.
