Life is a series of ups and downs.

Life is a series of vicissitudes.

I am studying Modern English.

Cao joined the military as a new cadet.

Recently, his popularity has been increasing.

I'll leave the ending of this story to your imagination.

His room is always miscellaneous, with things scattered around.

He is involved in the development of androids.

This ancient proverb, 'know the other side and yourself, and you will not be in danger in a hundred battles', teaches us the importance of understanding ourselves and others.

He has a deep interest in avant-garde art.