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有用

yǒu yòng word A1
  1. useful
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From the library

张衡的这个机器非常有名,也非常有用。
张衡和地震仪, p. 1 · A2
他补充说:“这种药对春天过敏非常有用。
春天过敏, p. 1 · B1

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