the mark ( : ) used to introduce a list, a summary, an explanation, etc. or before reporting what somebody has said 冒号 - (
anatomy 解剖学 the main part of the large intestine 结肠 
Word Originsense 1 mid 16th cent. (as a term in rhetoric denoting a section of a complex sentence, or a pause before it): via Latin from Greek kōlon ‘limb, clause’.sense 2 late Middle English: via Latin from Greek kolon.