核心问题
副词 sharp 与副词 sharply 有何异同？
词典解答
副词 sharp 与 sharply 都可作“突然地”“急剧地”解：
-
The car stopped too sharp. 这辆汽车突然停了下来。
-
The road bends sharply. 这条路转弯很急。
-
She looked up sharply when she heard someone come into the room. (CIDE) 当她听见有人走进房间时，猛然抬起头来。
此外,副词 sharp 还作“准时地(punctually)”解:
Come at six o'clock sharp. 请六点整来这里。