基本解释n. 安全帽英汉例句双语例句Voluntary safety helmet use by those accident-involved motorcycle riders was lowest for untrained, uneducated, young motorcycle riders on hot days and short trips.事故摩托车手中未受培训的、未受教育的、年轻的人群在天热或短途时自愿佩戴头盔的比例最低。