free;free of charge;for free;gratis;
例句:
It's FREEPOST, so there's no need for a stamp.
这是免费邮寄,不用贴邮票。
The Association gives a free handbook to all new members.
协会给新成员人手一本免费手册。
Free room and board are provided for all hotel staff.
宾馆的所有员工都可享受免费膳宿。