所以 suǒyǐ

  1. suǒyǐ conjunction therefore / as a result / so
    Domain: Modern Chinese 现代汉语 , Subdomain: Function Words 虚词 , Concept: Correlative 关联词
    Notes: This conjunction is often used as a connecting word in the main clause of subordinate complex sentences. It is often used in the pattern 因为…,所以… to express cause and effect (Sun 2006, loc. 2053).
  2. suǒyǐ phrase that by which
    Domain: Literary Chinese 文言文
    Notes: In Literary Chinese this phrase is composed of two characters, in contrast with the single word 'therefore' in modern Chinese (Pulleyblank 1995, p. 50).

Also contained in

之所以所以然不知所以忘乎所以知其然而不知其所以然

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Truncated for common words