n.坟墓；死亡
adj.严肃的；严重的；庄重的
v.雕刻；铭记；
You are just digging your own grave if you go on smoking so heavily. 你继续这样过度吸烟，就是在自掘坟墓。
用作形容词 (adj.)His face was grave when I told him my decision. 当我告诉他我的决定时，他的脸色很严肃。
The situation poses a grave threat to world peace. 这局势对世界和平构成了严重的威胁。
He announced the news in a grave voice. 他用庄重的声音宣布这一消息。
