美 
											[ɪm'penɪtrəbl]
																
										
							
																																	"an impenetrable fortress"
																							"impenetrable rain forests"
																															
																																	"dense smoke"
																							"heavy fog"
																							"impenetrable gloom"
																															
																																	"impenetrable jargon"
																															
Coats of mail gilded and silvered and impenetrable.
出自: Tolkien
Impenetrable banks of rhododendrons bordered the avenue.
出自: J. Johnston