1. He writes with penetration. 
   他写的文章尖锐深刻。
2. Point of penetration; breakthrough point 
   切入点
3. Penetration by foreign capitalism accelerated this process.  
   外国资本主义的侵入，促进了这种发展。
4. Resistant to penetration by water but not entirely waterproof. 
   抗水的能抵抗水的渗透但不完全防水的
5. a penetration of an enemy's defense in depth and strength. 
   在深度和强度上对敌人防御的突破。

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• 1. 未焊透
  {n.}贫农 poor penetration...未焊透 poor people...贫民 poor prisoner's defence act
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