seal chop stamp,三个都是章,有什么不一样?

seal [sɪːl]
n.印章,印信,图章; 封印纸; 封; 封条#海豹; 海豹皮
v.封,密封; 保证; 盖章,盖印于; 确认; 猎海豹
seal [si:l]
n.印章,封条,海豹
v.盖印,封闭,猎海豹
Examples:
This document carries the royal seal.
这份文件上盖有王室印章.
The seal on this bottle is broken.
这个瓶上的密封纸破开了.
The envelope was firmly sealed.
这个信封封得很严实.
chop [tʃɒp]
n.肋骨肉,排骨; 切球,削球; 砍,剁,劈; 切击#商标; 品质
v.砍,斩,劈; 劈成; 砍成; 劈出; 砍,猛击; 切球; 突然改变方向; 突然改变主意
chop [tʃɔp]
n.厚肉片,排骨
v.剁碎,砍,切
Examples:
The hunter cut off the animal's head with one chop of an ax.
猎人一斧砍下猎物的头.
She chopped the block of wood in two with a single blow.
她一斧头把木块劈成两半.
He chopped in with a sarcastic remark.
他突然插进一句讽刺的话.
stamp [stæmp]
n.邮票; 验讫的标签; 印花; 图章,戳子,印
v.贴邮票于; 盖章于; 贴印花于; 压印于; 跺脚; 拒绝,毁掉,扑灭; 踩; 捣碎
stamp [stæmp]
n.印,邮票,打印器
v.捺印,顿足,贴上邮票
Examples:
His face bears the stamp of suffering.
他的脸上有饱经苦难的烙印.
She stamped on the insect and killed it.
她踩死了一只虫子.
The stamp in your library book shows it must be returned tomorrow.
你从图书馆借的书上的戳记表明,这本书必须明天归还.
company's seal 公章
单位公章（Official seal）
common seal公章