grave : 一般的土墓，指埋葬尸体的场所。
- a mass grave
- an unmarked grave
- a grave digger
- He visits his mother's grave every Sunday.
- The tomb had been robbed of its treasures.
- People all over the world come to visit the tomb of Shakespeare.
- Wreaths were laid at the martyr's tomb.
vault : 指地下存放尸体或棺材的地方，也指用混凝土预制的墓穴。
- She was buried in the family vault.