Onan
油浸自冷（变压器冷却方式，Oil Natural Air Natural）
🗣️ 情景例句
Could you please say it again?
你能重复一下吗？
I used to have dinner at 7:30 and go to bed early.
我过去常在7:30吃晚饭并且早睡觉。
Which books did you buy?
您买的是两本什么书？