His dog started to go into heat yesterday.

His dog has entered the mating season.

Smoking increases the risk of carcinogenesis.

That news caused an immediate crisis.

His anger exploded immediately, and the whole room was enveloped in a tense atmosphere.

She goes to school every day with her hair bundled up.

I hung the laundry under the sun to whiten it by exposure.

She ran off, her long hair flying.

When applying for a new passport, you first need to be issued a number.

Please issue a new number for the new project.