Translation of "Flasks" in Chinese

Obviously, we don't know if those thermos flasks are their own.

当然，那些热水瓶是不是他们自己的就不得而知了。

The school won't turn on the air conditioning, so the students are going to throw their hot water flasks off of the balcony in protest.

学校不给开空调，学生们就会从阳台上扔热水瓶抗议。