后背: the back (human anatomy), the back part of sth...
质量: quality, (physics) mass...
查明: to investigate and find out, to ascertain...
验: to examine, to test, to check...
隧道: tunnel...
风雨: wind and rain, the elements, trials and hardships...
服从: to obey (an order), to comply, to defer...
赏: to bestow (a reward), to give (to an inferior), to hand down, a reward (bestowed by a superior), to appreciate (beauty)...
座位: seat...
孪生: (adj.) twin...
