心中有數 (sam1 zung1 jau5 sou3) — know fairly well in Cantonese
samˉ¹心zungˉ¹中jauˏ₅有sou˗₃數简 心中有数
Mandarin Pinyin: xin1 zhong1 you3 shu4
Meaning of 心中有數
nounknow fairly well
nounone who had made a decision within
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