从1933年起，每一届世博会都设有明确主题。
Since 1933, each world exposition has been provided with a specific theme.
从1933年起，每一届世博会都设有明确主题。
Since 1933, each wold exposition has been provided with a specific theme.
毛毛：没错。但从1933年起，每一届世博会才设有明确主题。
Maomao: Yes, but not all world expositions were provided with a specific theme until 1933.
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