In ancient Chinese astronomy, they used the earthly branches to express time and direction.

Mr. Ochi is my best friend.

Mr. Adachi is my best friend.

Mr. Chida is my best friend.

I use a set square to draw shapes.

In chemistry class, I learned about acid anhydride.

In chemistry class, I learned about acidic oxides.

Lower fatty acids play an important role in the human body.

Essential fatty acids are necessary to be taken from our diet because our body cannot produce them on its own.

Essential amino acids are vital nutrients for the human body.