Concave shape

常见例句

• The cloven hooves are sharp edged, elastic and concave.
  蹄鋒利，呈凹形，富有彈性。
• This article has described expanding method for repairing the concave retaining ring caused by the hydraulic bulging.
  詳細介紹了用擴沖法對液壓脹形出現凹形的護環進行脩複的方法。
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