He and I are sworn brothers.

She is my sworn elder sister, always protecting me.

Please prepare in one minute.

Please think for a moment.

His reputation is very high.

When a bee colony splits, the new queen bee and some worker bees leave the old nest to create a new one.

In spring, it is common for bee colonies to swarm.

I like studying Chinese literature.

Kanbun is my best friend.

The calculation of integrals is an important part of mathematics.