Biorthogonality
[计] 双正交
🗣️ 情景例句
What about your arms? Lift your arms up like this.
你胳膊怎么样?手抬起来， 像这样。
Will this flight leave on time?
这班机准时起飞吗？
Sure! When do you want it?
当然可以！您什么时候要？