The demagogue understands how collective sentiments work and how he -- it's usually a he -- can benefit from them.

煽动者了解集体情绪是如何运作的，以及他——通常是他——如何从中受益。

Such catchphrases have become an essential part of the digital lexicon in recent years and are used by Chinese social media users to express a collective sentiment.

近年来，这类流行语已成为网络词汇的重要组成部分，被中国网民们用来表达一种集体情绪。