Mathematical expectation
[计] 数学期望
🧩 词语组成解析
🗣️ 情景例句
You must have the wrong number.
你一定打错电话了。
Would you like to go for a walk?
你想要去散步吗？
Both men had just begun to swim towards the shore, when they noticed with dismay that the speedboat was moving in a circle.
两个人刚开始向岸边游去，就突然惊愕地发现快艇正在转着圈行驶，