sharp [adj.] 敏锐的:灵敏的;锋利的;尖的 The man's mind ____, even though he is 80 years old. 虽然已年届八十,那位老人的思维仍然很敏捷。 The shears aren't ____cut the grass. 这把大剪刀不够快,剪不动草。 ____ [v.] 削尖;使敏锐 This knife ____. 这把刀要磨一下。 sharpness [n.] 灵敏;敏锐;锋利 sharpener [n.] 卷笔刀