HSK 7-9
得力
délì形
able; capable; competent; efficient
她是经理身边最得力的助手。
Tā shì jīng lǐ shēn biān zuì dé lì de zhù shǒu.
She is the manager's most capable assistant.
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Appears across levels (7-9) in the HSK 3.0 word list.