1，我知道他把钱看得很重，但叫他小气鬼会使他不高兴。
I know he is careful with money , but calling him mean was bound to ruffle his feathers.
2,他必定会擦觉你的错误。
he's bound to notice your mistake .
by chance "偶然地，碰巧地，意外地“
for instance：
1，she tried to commit suicide , but we saved her life by chance .
她试图自杀，但我们碰巧救了她。
2，he had a slip of tongue by chance .
他偶然说走嘴。
