Unicel
二亚硝基五亚甲基四胺(发泡剂)
🗣️ 情景例句
Pleased to meet you.
很高兴见到你。
To operate a steam locomotive
驾驶蒸汽机车
It's always warm in April and May,but it rains sometimes.
4月和5月的天气总暖洋洋的，但有时下雨。