used to agree with something that has just been said, or to avoid repeating something that has been said

"I hate reality TV shows" "Ditto." “我讨厌这些真人秀电视节目。”“我也是。”

Local residents are opposed to the proposal. Ditto many members of the city council (= they are also opposed). 当地居民反对这个提案，很多市议会议员也是如此。

a symbol " that means "the same" and is used in a list to avoid writing again the word written immediately above it