Foto
abbr. 张紧振子的强制振动（Forced Oscillation of a Tightening Oscillator）
🗣️ 情景例句
Hello. Is Susan there?
喂，是苏珊吗？
He's getting used to thinking in English.
他正在养成用英语思维的习惯。
I borrowed his copy of the timetable.
于是我借他本人的列车时刻表，