| 单词 | penetration | 
| 释义 | pen·e·tra·tion    (pĕn′ĭ-trāshən)n. 1.  The act or process of piercing or penetrating something, especially: a.  The act of entering a country or organization so as to establish influence or gain information. b.  An attack that penetrates enemy territory or a military front. c.  Insertion of the penis into the vagina or anus. 2.  The power or ability to penetrate. 3.  The depth reached by a projectile after hitting its target. 4.  a.  The degree to which a commodity, for example, is sold or recognized in a particular market. b.  The extent of influence that one culture or nation has on another. 5.  The capacity or action of understanding; insight.  | 
	
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