Ooking
(ook 的现在分词) abbr. 通断键控；开关键控（On-Off Keying）
🗣️ 情景例句
We prefer to have payment in US dollars. It may be difficult for us to do so.
我们用美元付款。用人民币支付可能有些困难。
It is a poor heart that never rejoices.
不知世间有乐者最可怜。
Hello. Can I speak to Zhou Lan, please?
喂！请问周兰在吗？