sì shèng dì
the Four Noble Truths (Buddhism)
see also 四諦|四谛[si4 di4] and 苦集滅道|苦集灭道[ku3 ji2 mie4 dao4]
四
sì
four
圣
shèng
(bound form) peerless (in wisdom, moral virtue, skill etc)
谛
dì
to examine
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