Pdm
[电] Pulse-Duration-Modulation的简写
🗣️ 情景例句
I'm sorry, I can't help you. I'm just a tourist also.
很抱歉，我帮不了你，我也只是个游客。
Please quote us your price on FOB basis, indicating the postage for dispatch by parcel post to Dalian via Tianjin.
请报FOB价，注明邮寄包裹途经青岛至大连的邮资。
What's in that cave?
岩洞里会有什么？