Sst
abbr. 超音速运输机（supersonic transport）
🗣️ 情景例句
Industry spokesmen have stated that there's no threat posed to the environment.
工业发言人说他们没有对环境构成威胁。
It's been a long time.
好久不见了。
You'll have to wear this hard hat for the tour.
参观时必需戴上这安全帽。