Smokescope
烟雾浓度; 烟雾浓度测量器
🗣️ 情景例句
So long.
再见。
Soon up, soon down.
升得高，落得快。
Aeroplanes have the reputation of being dangerous and even hardened travellers are intimidated by them.
飞机以危险而著称，连老资格的旅行者也怕飞机。