Definition: a mark (:) used before a list, an example, an explanation, etc. Level: B2
那个句子缺了一个冒号。
There's a ___colon missing in that sentence.
使用冒号来引入一个列表：苹果、香蕉和橙子。
Use a ___colon to introduce a list: apples, bananas, and oranges.
老师解释说冒号用于例子之前。
The teacher explained that a ___colon is used before an example.
