先理解核心含义，再看它在真实句子里的用法。
对敌军领土的侵入或渗透。
An attack that penetrates into enemy territory.
The penetration of the needle through the leather was surprisingly easy.
针穿过皮革的过程出奇地容易。
多用于军事语境。
The company achieved deep market penetration in the first year.
该公司在第一年就实现了深入的市场渗透。
His penetration of the author's intentions revealed hidden meanings.
他对作者意图的洞察揭示了隐藏的含义。
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Dictionary facts from ECDICT.