Topoisomerase
局部异构酶
🗣️ 情景例句
Havefun!
开心点。
I don't have the time for any more extra-curricular activities.
我没有更多的时间从事课外的活动了。
Is that all? He doesn't say very much,does he?
就这些吗？他没写许多，是吗？