He completely forgot my help, acting like an ingrate.

He is working hard to make his abilities known to the world.

He is still young and ignorant of the ways of the world.

Because he was raised in the countryside, he is completely ignorant of city life.

This white soil is said to be very good for plant growth.

I went fishing in Shiranui.

The new car is painted jet black, and it's very beautiful.

Silicon is widely used in the manufacture of semiconductors.

Uracil is one of the components of RNA.

The night sky turned jet black, and the stars were shining brightly.