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Definitions2 characters
yi4 wu4
duty; obligation (CL: and xiang⁴)/volunteer (work etc)
Usage•••frequent
Pronunciations

As word

1
yi4
duty; obligation (CL:項|项 [xiang4])/volunteer (work etc)
2
wu4
duty; obligation (CL:項|项 [xiang4])/volunteer (work etc)