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service box line /ˈsɜːvɪs ˈbɒks ˈlaɪn/ n

中文：发球区线

中文 · 发球区线Español · línea de cuadro de servicioFrançais · ligne de boîte de service
Meaning：Line drawn 46 cm from the sidewall that marks the service box at both ends of the service zone.
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