impenetrable
adj
1 ~ (to sth) that cannot be entered, passed through, etc 不能通过的; 不可穿越的; 透不过的
an impenetrable jungle, swamp, fortress, etc 无法通过的丛林、 无法经过的沼泽、 不可 越的要塞
impenetrable darkness, fog, etc, ie that cannot be seen through 一片漆黑、 浓雾重锁
(fig 比喻) his impenetrable ignorance 无法启迪的愚昧.
2 impossible to understand or solve 不可理解的; 无法解决的
an impenetrable difficulty, mystery, problem, etc 无可克服的困难、 难解之谜、 百思莫解的问题
This history book is completely impenetrable to me. 这本历史书我完全看不懂.
Bagrit dismissed the idea that computers would learn to 'think' for themselves and would 'rule the world', which people liked to believe in those days.