Concave shape

常見例句

• 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(xì)介紹了用擴(kuò)沖法對(duì)液壓脹形出現(xiàn)凹形的護(hù)環(huán)進(jìn)行修復(fù)的方法。
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