Biorthogonality
[计] 双正交
🗣️ 情景例句
I took him to Philip's office yesterday for a checkup.
我昨天带他到Philip的办公室去做检查。
The worst misfortunes are these that never hzppen.
最大的不幸是害怕不会发生的不幸。
I will have to choose presents for all the family soon, but I haven't chosen any yet!
我很快就要为每一位家庭成员选购礼物，但我至今还什么也没买！