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.

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。