Concave shape

常见例句

• The cloven hooves are sharp edged, elastic and concave.
  蹄锋利，呈凹形，富有弹性。
• This article has described expanding method for repairing the concave retaining ring caused by the hydraulic bulging.
  详细介绍了用扩冲法对液压胀形出现凹形的护环进行修复的方法。
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