Biharmonic operator
[计] 双调和算子, 重调和算子
🧩 词语组成解析
[计] 重调和的
🗣️ 情景例句
I promised you a surprise, didn't I?
我答应过要给你一件惊喜， 不是吗？
He keeps on studying ecology.
他不断攻读生态学。
While two detectives were keeping guard at the door, two others opened the parcel.
这时两个侦探把住门口，另外两个侦探打开了包裹。