by a chance

基本解释

Her life was changed by a chance meeting with her former art master a few years ago.
她的生活因幾年前同她以前的美術老師的偶遇改變了。
A game, usually played for money or stakes, in which the winner is determined by a chance event, as by drawing numbers or throwing dice.
靠運氣定勝負的比賽：一種常爲錢或賭注而進行的比賽，比賽中獲勝者全靠機會決定，一般採用抽簽或擲骰子的方式。
But by a chance, Pip helped a convict; he gave much food to him.
但是一個偶然的機會，他幫助了一個囚犯，給了他很多食物。

Blinded by a meaningless imperfection and an impossible goal, Aylmer had thrown away her life and with it his chance for happiness.
If the land isn't taken up by large oligarchies life slaveholding class--then the small guy has a chance.
如果土地沒有被大的壟斷方佔有,奴隸堦級,弱小的一方就仍會有希望
耶魯公開課 - 美國內戰與重建課程節選
Now, if you are standing there with your -- by the way the first three rows have a chance of hitting each other.
現在,如果你站在那裡用你的 --,順便提一下前三排有機會互相攻擊
耶魯公開課 - 古希臘歷史簡介課程節選

It plays an important social role by offering a chance for self-expression in a communal setting.
UNESCO: Culture