impenetrable

adj.

不能通过的；不能理解的；无动于衷的；顽固的，不接受的

1. Armor plate is impenetrable by ordinary bullets.
   装甲板普通子弹打不穿。
2. Some wild pheasants love impenetrable jungles.
   有些野雉喜欢生活在密密的丛林里。
3. The motive for the crime was impenetrable.
   那起罪行的作案动机叫人捉摸不透。
4. This history book is completely impenetrable to me.
   这本历史书我完全看不懂.

Influence of an impenetrable interface on a polymer glass
Transcending the impenetrable: how proteins come to terms with membranes.
Metasurfing: Addressing Waves on Impenetrable Metasurfaces
General Principles of the CISG -- Generally Impenetrable?
Density matrix of an impenetrable Bose gas and the fifth Painlevé transcendent
Relationship between Systems of Impenetrable Bosons and Fermions in One Dimension
Theory of Protein Titration Curves. I. General Equations for Impenetrable Spheres
Schizophrenia from a neurocognitive perspective: probing the impenetrable darkness
Atomic Scattering in Presence of an External Confinement and a Gas of Impenetrable Bosons
Bacteria penetrate the normally impenetrable inner colon mucus layer in both murine colitis models and patients with ulcerative coli...