Since escaping that winter during a battle in the tora bora region of eastern afghanistan , bin laden had defied american efforts to trace him .
自从那年冬天在阿富汗东部torabora地区的战斗中逃脱之后,本拉登已挫败了美国追踪其行踪的努力。
Perhaps of liver or kidney failure , perhaps killed in the alliedassault on the afghan tora bora mountains in 2001 , perhaps assassinated at someother time .