免费

free (of charge);gratis;complimentary
展览会～参观。Admission to the exhibition is free (of charge)./～服务free service/～公路toll-free highway/～教育 free education;compulsory education/～匿名检测free and confidential test /～入场free admission;be admitted gratis /～试用free trial/～送货free delivery/～午餐free lunch/～学校free school/～医疗free health (or medical) service;free medical treatment/～赠送complimentary(copies);with the compliment of;give (or be given) as a gift/～宣传品free publicity/～赠阅报纸freesheet