海底单词 Big Kahuna Words

托底单向流 backstreaming

反底单边 reverse jersey

平底单鞋 Flats ; Flat Shoes ; Fat bottom ; sam edelman ; flat single shoes

海底单模光缆 submarine single-mode fiber cable

存款底单 pay-in slip ; in slip

银行汇款底单 bank remittance

基底单位向量 basis unit vectors

必看经底单 must-see sights

灰底单黑卡纸 Single black paper