Einstein proposed the theory of relativity.

His actions always have a duality.

Radioactive elements are produced in nature and scientific experiments.

This software has forward compatibility.

This software maintains backward compatibility.

He was diagnosed with congestive heart failure.

Mr. Shimooka is my best friend.

Konohanasakuyahime, who appears in Japanese mythology, is considered a symbol of beauty and purity.

In this park, a tree called Kogatama-no-ki, an alternative spelling of Shourei-no-ki, is planted.

He remembered the proverb 'even a pig will climb a tree if flattered', and complimented his boss.