a great calamity的用法和样例：
- His becoming blind was a great calamity.
- The frost last week was a great calamity to the citrus industry.
- It is a great calamity for people and properties of paroxysmal water pollution.
- A fierce battle started in Soleil, which meant a great calamity of nature started.
- He is a great guy, a chip off the old block.