1 to go through or into sth, especially when this is difficult （尤指很不容易地）进入，渗入，穿过，穿透: The knife penetrated ten centimetres into his chest. 刀子刺入他的胸膛达十厘米深。

2 to manage to understand sth difficult 设法了解，明白（难懂之物）: Scientists have still not penetrated the workings of the brain. 科学家仍没有搞清大脑的运作机理。

3 to be understood or realized 被了解；被领悟: I was back at home when the meaning of her words finally penetrated. 我回到家后，她话的意思我总算明白。 ➔penetration /ˌpenɪˈtreɪʃn ||; ˌpɛnəˈtreʃən/ noun [U]