Zedeflon
四氟乙烯均聚物
🗣️ 情景例句
Davis Aerobics Center for Good Health.
Davis有氧运动健身中心。
Knowledge will not be aquired without pain and application.
不花力气，不下功夫是得不到知识的。
Did he say what it was about?
他讲了什么事吗？