The World Health Organization is working to improve public health worldwide.

My grandfather used to be a steam locomotive driver.

I commute to work every day using public transportation.

He received training to handle a heavy machine gun.

He is good at handling a light machine gun.

By regularly checking the key performance indicators, you can understand the performance of the company and devise improvement measures.

The history of the Empire of Japan is very interesting.

The Empire of Japan, written as 大日本帝國 in Kyūjitai, was a nation that existed from 1868 to 1945.

The Imperial Japanese Army was a Japanese military force that existed from the Meiji era to the Showa era.

The Imperial Japanese Navy was once the navy of Japan.