wěn​cāo​zuǒ​quàn

to be certain of success

稳操左券 穩操左券 wěn​cāo​zuǒ​quàn
to be certain of success
To be sure of winning or achieving an aim; to have full assurance of success. In ancient times, a contract was split into two halves and the left half was held by the creditor as proof of debt.

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