HSK 7-9
大为
dàwéi副
very; greatly
新措施让工作效率大为提高。
Xīn cuò shī ràng gōng zuò xiào lǜ dà wéi tí gāo.
The new measures greatly improved work efficiency.
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Appears across levels (7-9) in the HSK 3.0 word list.