Subgradient
次梯度
??? 情景例句
Do you think the end is all right?
你看結尾還行嗎？
So-so.
一般般啦！
Perhaps the most extraordinary building of the nineteeth century was the Crystal Palace, which was built in Hyde Park for the Great Exhibition of 1851.
19世紀最不尋常的建筑也許要數水晶宮了，它是為1851年的“世界博覽會”而建在海德公園的。