adv.免费的，无偿的
adj.免费的

The museum offers free admission on Sundays.
博物馆在周日提供免费入场。
The software comes with a gratis license for personal use.
该软件附带一个个人使用的免费许可证。
The library provides gratis access to its digital resources for all members.
图书馆为所有成员免费提供其数字资源的访问权限。
The restaurant offers a gratis dessert for customers celebrating their birthday.
餐厅为庆祝生日的顾客提供免费甜点。
The conference offers gratis attendance to students, encouraging their participation.
大会向学生提供免费参加的机会，鼓励他们参与。
The hotel gives gratis shuttle service to and from the airport for its guests.
酒店为客人提供往返机场的免费班车服务。
The online course includes gratis tutorial videos and study materials.
这门在线课程包含免费的教程视频和学习材料。
The music festival offers gratis entry to children under the age of 12.
音乐节对12岁以下儿童免票入场。
The store occasionally runs gratis product sampling events to attract customers.
商店偶尔会举办免费产品试用活动以吸引顾客。
The author's website provides gratis e-book downloads to promote her latest novel.
作者的网站提供免费电子书下载，以宣传她的最新小说。