吃力: to entail strenuous effort, to toil at a task, strenuous, laborious, strain...
大体上: overall, in general terms...
免不了: unavoidable, can't be avoided...
野生: wild, undomesticated...
曲线: curve, curved line, indirect, in a roundabout way...
要好: to be on good terms, to be close friends, striving for self-improvement...
铁路: railroad, railway...
有口无心: to speak harshly but without any bad intent (idiom)...
尖锐: sharp, intense, penetrating, pointed, acute (illness)...
间隙: interval, gap, clearance...
