HSK 7-9
必定
bìdìng副
to be bound to; to be sure to
产品不断改进必定更受欢迎。
Chǎn pǐn bú duàn gǎi jìn bì dìng gèng shòu huān yíng.
A steadily improving product is bound to become more popular.
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Appears across levels (7-9) in the HSK 3.0 word list.