Foto
abbr. 张紧振子的强制振动（Forced Oscillation of a Tightening Oscillator）
🗣️ 情景例句
who used to run the drugstore in town.
他过去在镇上经营药房。
It's a nice day today.
今天天气很好。
Oh, yes.we don't carry that item anymore.
哦，是的，那一项目我们不再卖了。