Levulinamide
4-氧(代)戊酰胺
🗣️ 情景例句
We must prepare ourselves to have a hard time.
我们必须准备过艰苦的日子。
Don't you think you've eaten enough?
你不是吃的很多了吗？
since ground stations and satellites cannot see everywhere.
因为地面工作站和卫星不可能看到地球上的每一个地方。