Heptasulfide
七硫化物
🗣️ 情景例句
before Michelle and her friends arrived.
在Michelle和她的朋友们来之前。
The new leaves in springtime have a soft touch.
春天的新芽有柔软的触感。
She arrived in England a week after the Thermopylae.
它抵达英国时比“塞姆皮雷”号晚了1个星期。