Felli费利fellvt.砍伐；击倒n.丘原；沼泽地adj.凶残的；毁灭性的动词fall的过去式.Fell to work immediately.突然精力充沛地投入工作fell where the shoe pinchesadj.知道困难的原因在哪里fell behind with one's workfelliptical glass reflector椭圆偏振光fell upon difficult times.困难时期Felling tree is for bidden.禁止砍伐树木。Felling trees is forbidden.禁止砍伐树木。Fell into the foaming brine.掉进冒着泡末的盐水里。Fell-O'Dwyer method of artificial respiration