tooth -- 牙齿My tooth really hurts.我的牙很疼。baby tooth -- 乳牙It's a baby tooth.这是颗乳牙.如果咱们的乳牙掉了,大家会怎么办呢?If it is a lower baby tooth, throw it up onto the roof.如果是下边乳牙(掉了),就把它扔到
近日,美国卫生及公共服务部发布了第15版致癌物报告,新增8种致癌物,其中,幽门螺杆菌慢性感染被列为明确致癌物(known to be a human carcinogen)。Eight substances have been added to the US Report on Carcinogens, a cumulative rep