概率chance
例：
这场比赛我们队获胜的概率不大.Our team stands little chance of winning the game.
只有百分之一的概率.There in only one percent chance.
概率很小.The chance is very slim.
probability是专业术语用词,如：
误差概率error probability
概率论probability theory; law of probability
“什么事情的概率很低”怎么说,用probability possibility