Chalkogenide
硫属化物
🗣️ 情景例句
Can I use your car for a couple of hours?
我们能借你的车用几个小时吗？
If I had had time,I would have called you.
如果我有时间，我就打电话给你了。
'I've been coming up here night after night for weeks now.
“好几个星期了，我天天夜里到钟楼上来。