频繁: frequently, often...
立交桥: overpass, flyover...
官兵: (military) officers and soldiers, officers and men, (old) government troops...
困惑: bewildered, perplexed, confused, difficult problem, perplexity...
填空: to fill a job vacancy, to fill in a blank (e.g. on questionnaire or exam paper)...
经受: to undergo (hardship), to endure, to withstand...
马戏: circus...
顾虑: misgivings, apprehensions...
燃料: fuel...
诱发: to induce, to cause, to elicit, to trigger...
