sharp

Without any tools, early humans used stones, bones of animals, and sharp pieces of wood to dig, hunt and cut their food.

在没有任何工具的情况下，早期人类使用石头、动物骨头和锋利的木头来挖掘、狩猎和切割食物。

[2021 德州市卷 阅读理解]

With time going, tools made of bones and stones were replaced with metal (金属的) ones which were stronger, sharper, and long-lasting.

随着时间的推移，由骨头和石头制成的工具被更坚固、更锋利、更耐用的金属工具所取代。

[2021 德州市卷 阅读理解]

These meat-eating fish have sharp (尖利的) teeth.

这些食肉鱼有锋利的牙齿。

[2020 锦州卷 任务型阅读]

Playing an instrument or singing can help us do better in school and keep our brain sharp (敏锐的) as we get older.

演奏乐器或唱歌可以帮助我们在学校取得更好的成绩，并随着年龄的增长保持大脑的敏锐。

[2018 江西卷 七选五]

He felt a sharp pain in his knee.

他感到膝盖一阵剧痛。

[2021 包头市卷 词语运用]

If you're happy, your mind will become livelier and your memory will become sharper.

如果你快乐，你的思维会变得更活跃，你的记忆会变得更清晰。

[2018 沈阳市卷 阅读与表达]

I got a seat opposite a middle-aged man with sharp eyes, who kept watching a young woman in a window seat.

我在一个目光锐利的中年男子对面找了个座位，他一直看着靠窗座位上的一个年轻女子。

[2021 北京卷 完形填空]

Your Tough Job Might Help Keep You Sharp.

你艰难的工作可能会帮助你保持敏锐。

[2020 浙江卷 阅读理解]

Challenging work that requires lots of analytical thinking, planning and other managerial skills might help your brain stay sharp as you age.

需要大量的分析思维、计划和其他管理技能的挑战性的工作可能有助于你的大脑随着年龄的增长而保持敏锐。

[2020 浙江卷 阅读理解]

To construct a working still, use a sharp stick or rock to dig a hole four feet across and three feet deep.

要建造一个工作蒸馏器，用一根锋利的棍子或石头挖一个四英尺宽、三英尺深的洞。

[2017 全国卷1 阅读理解]

Only a sharp reduction in the number of cars on the road will make a meaningful difference.

只有道路上的汽车数量急剧减少才会产生有意义的变化。

[2020 浙江卷 阅读理解]