Backward difference
[计] 后向差分
🧩 词语组成解析
🗣️ 情景例句
One moment, please.
请等一下。
By accident Marion overheard some nasty gossip.
马里恩偶然听到了一些令人不愉快的谣言。
Fortunately, the shouting woke up my wife who opened the window just as the policeman had started to climb towards me.
幸运得很，这喊声惊醒了我的妻子。就在警察开始向我爬上来时，她打开了窗子。