Plumbane
烃基铅
🗣️ 情景例句
What a price! Lower it, please?
这么高的价格！请降点。
Could you tell me the cost of production per unit?
请你告诉我每件成品的生产成本好吗？
The test finished. We began our holiday.
考试结束了，我们开始放假。