For some reason, I can't convert this sentence.

Affine transformation is an important concept in geometry.

A proper fraction refers to a fraction where the numerator is smaller than the denominator.

A mixed number is a number that has an integer part and a fraction part.

She is a married woman and has two children.

He marked my message as read, but he hasn't replied yet.

This function requires two formal parameters.

This text is a tentative translation, so the content may change in the final version.

He lives in a small shack in the mountains.

He seems to think he's my practice boyfriend.