“narrow into”造句，怎麼用narrow into造句

Ren Feng-nian's ability to frighten herself was no less than her temper. After walking for half a day, her mouth would gradually narrow into a slit.

The head of the kitten is round, with pointed ears; the big eyes always narrow into a crack during the day, but at night, they are like two shining gems, emitting a faint blue light.