Life is a series of ups and downs.

He does his work perfectly, dotting the i's and crossing the t's.

I conducted an interview in a question-and-answer format.

Gender identity refers to the gender that each individual recognizes themselves as.

He publicly disclosed that he has a gender identity disorder.

I've had severe diarrhea since yesterday, and I can't eat anything.

I had diarrhea all night, maybe because I ate something strange yesterday.

She was a secret kunoichi (female ninja).

He threw a handful of sand into the sea.

"Once in a lifetime" means to cherish the encounter that happens only once in one's lifetime.