不知: not to know, unaware, unknowingly, not to admit (defeat, hardships, tiredness etc)...
纪录片: newsreel, documentary (film or TV program)...
思前想后: to consider past cause and future effect (idiom); to think over the past and future, to ponder over reasons and connection...
妨害: to jeopardize, to be harmful to, to undermine...
邻国: bordering country, neighbor country, neighboring countries, surrounding countries...
码: a weight, number, yard, pile, stack...
