请问 calamity 与 disaster 的区别？

calamity
1 : a state of deep distress or misery caused by major misfortune or loss
2 : a disastrous event marked by great loss and lasting distress and suffering <calamities of nature> <an economic calamity>

disaser
1obsolete : an unfavorable aspect of a planet or star
2: a sudden calamitous event bringing great damage, loss, or destruction; broadly : a sudden or great misfortune or failure <the party was a disaster>

disaster指“不可预测的意外事件所造成的灾难或不幸”, 如:
These difficulties are caused by natural disasters.
这些困难都是由自然灾害造成的。
calamity指“巨大而严重的不幸或灾难”, 如:
The attack on Pearl Harbor was a crushing calamity.
偷袭珍珠港(对美军来说)是一场毁灭性的灾难。
catastrophe指“突然造成极严重的灾难”或“异常的灾祸”, 含“最终结局无法补偿之意”, 如:
A big earthquake is a catastrophe.
大地震(对人类)是异常的灾祸。

disaster， calamity， catastrophe， misfortune

这些名词均表示“灾难”或“不幸”之意。
disaster普通用词，指大破坏、痛苦或伤亡。
calamity多指个人的不幸，比disaster严重，强调灾难引起的