It is reported that North Korea has conducted another underground nuclear test.

Nuclear tests pose a great threat to world peace.

Establishing a new company requires time and effort.

He had a conviction in his own correctness.

He passed the exam.

He had a deer antler displayed on the wall.

This game is ideal for learning the basic rules.

In Japanese grammar, verbs with k-row irregular conjugation are characteristic.

Verbs of the sa-line irregular conjugation are a special existence in Japanese.

Verbs of the 'ra-row irregular conjugation' are a special existence in Japanese.