Levorphan
左吗喃; 羟甲左吗喃
🗣️ 情景例句
I'm really concerned about going away for the weekend, Ellen,
我这个周末出门实在放心不下， Ellen，
What's wrong now?
现在又怎么了。
For our purposes, we are concerned only with one kind of cost----
就我们的目的而言，我们只关心一种费用-