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1. 每次挑战都有一个主题，而今年的主题就是发明。

   měi​cì tiǎo​zhàn dōu yǒu yī​ge zhǔ​tí, ér jīn​nián de zhǔ​tí jiù​shì fā​míng.

   Every challenge has a theme, and this year’s theme is invention.

   Source: CCMatrix