Perstans
[医] 永存的, 久存的
🗣️ 情景例句
Room service. May I help you?
客房服务部，需要我为您效劳吗？
Kept waving to her mother until the train was out of sight.
不断地冲她的母亲挥手，直到火车驶出了视线。
Thanks.
谢谢。