The desert black cobra is a very dangerous snake, its venom is lethal to humans.

A black-necked swan was swimming in the park's pond.

As the name suggests, the black widow spider is a spider with a black body.

I heard the beautiful song of a common blackbird in the park.

In physics, blackbody radiation is a very important concept.

He said, 'Where there is a will, there is a way,' and faced the difficult situation.

He strongly believes in the philosophical thought, 'I think, therefore I am.'

My cat has been infected with the feline immunodeficiency virus.

After he solved the problem, he said, 'It's like seeing the true form of a ghost or a withered silver grass,' meaning things are not as scary as they seem.

He always keeps in mind the phrase 'If one learns without thinking, it is a waste.'