Gōngzuò zhōng chūxiàn zhèyàng de pīlòu shì bùyīnggāi de.
Such a slip-up in the work should not have happened.
Tips
memory
Almost always in 纰漏 (slip-up). The silk radical fits its original sense of a flaw in woven cloth, now extended to any careless mistake that slips through.
