Ksu
abbr. key service unit 密钥业务单元
🗣️ 情景例句
I'm sorry to say this, but there seems to be a mistake.
对不起，这儿好像有个错。
He who is ashamed of asking is ashamed of learning.
耻于问者耻于学。
Instead of catching fish,they catch old boots and rubbish.
他们往往鱼钓不到，却钓上来些旧靴子和垃圾。