Spiran
[机] 螺环化合物
🗣️ 情景例句
He's been here for years, he should know the ins and outs of the job by now.
他在这里已经好多年，现在理应熟悉各方面的工作了。
Did you watch the new office building being built?
你看过在建设中的新的办公楼吗？
Keep it up!
坚持下去！