He opened the manhole and checked the sewer.

In this incense burner, expensive agarwood is burning.

The computer has frozen, so it needs a restart.

The computer froze, so I restarted it.

The bacteriology class is very interesting.

The technology of artificial rainmaking greatly contributes to agriculture in arid regions.

This ancient document uses the word 'genki'.

This magazine has been reduced in number of pages, and it has become thinner than before.

He solved a large number of problems.

Understanding numbers is important for solving math problems.