顶用的英文：
to be of use

参考例句：
  • This tool best answers to the purpose.
    这把工具最顶用。
  • The roof of the tunnel was supported by wooden props
    坑道顶用木柱支撑。
  • The contract specifies red tiles for the roof.
    合同载明屋顶用红瓦，而非石板。

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