选择客厅墙壁的颜色绝非易事。Choosing the colour for the drawing-room walls was no easy matter.盘活那家公司绝非易事。Turning the company around won't be easy.涉足教育界绝非易事.It is difficult to get a foot into the door of teaching....
这场战争必须速战速决，尽量兵不血刃。This war had to be fought fast and relatively bloodlessly.带锯齿刃的刀a knife with a serrated edge有四面刃头的箭是从石弓发出来的.An arrow with a four - edged head is shot from a crossbow....