Aerotex
甲醛, 三嗪聚合物
🗣️ 情景例句
What was your speciality?
你学的是什么专业？
Ignorance is the mother of impudence.
厚颜无耻由于愚昧无知。
Looking round, I realized with a shock that I was the only passenger left on the bus.
我环视了一下身旁，惊奇地发现车里就只剩我一个乘客了。