Central difference notation
[计] 中心差分记法
🧩 词语组成解析
🗣️ 情景例句
How long does it take you to get through a letter?
你写一封信要花多少时间？
Put your pants on.
穿上你的裤子。
Heavy iron chains around his feet and hands were fixed to a metal bar that ran round the hall about ten centimetres off the ground.
手上和脚上沉重的铁链拴在厅堂四周离地约有10厘米的金属杆上。