The van der Waals force is an important concept in explaining intermolecular interactions.

He has a high ability to hold a conversation, so he can get along with anyone quickly.

When the new year begins, I send a message to my friends saying 'ake ome koto yoro'.

He lifted the heavy luggage while saying 'yokkoishoichi' as a joke.

In this restaurant, you can choose from a wide variety of menus as you please.

Happy New Year, Ka.

I will hold my birthday party on the fourth day of the month.

This old radio uses a tetrode.

My father is forty-one years old.

The moon has risen, and it's time to return the robe of night.