My son says he wants to become a doctor.

I think that adding anything more to this already perfect function would be superfluous.

Tomorrow, I will go to the mountain on a school excursion.

Yakitori is skewered and grilled.

Mr. Kushi is my best friend.

He sent me a 'kushi' (slang for a short message or information).

He excels in the ability to command English.

He made excellent use of that opportunity to fully demonstrate his abilities.

My grandmother has weak sight, so it's difficult for her to read small letters.

It's difficult to decipher this chemical equation.