He ran up the stairs.

He is from the Hui people, a minority ethnic group in China.

It will take time to solve this problem.

He is working hard to figure out the mystery.

We will hold a cultural festival next week.

Japan reformed its calendar in the fifth year of the Meiji era and adopted the Gregorian calendar.

Japan revised the calendar in 1873 and adopted the Gregorian calendar.

He dissected a frog in his biology class.

The resolution of this camera is very high.

My doubts about his words deepened.