Semidefinite
[计] 半定的
🗣️ 情景例句
This is very helpful, Mrs. Martinelli.
这样很有用， Martinelli太太。
I need the change for the stamp machine.
我需要投入自动售邮票机的零钱。
Words can't express what I felt then.
无法用语言形容我当时的感受。