sharpens
v.
（使）提高( sharpen的第三人称单数 );
（使声音）变得尖锐;
（使）变得更好（或技术更高、更有效等）;
（使）变得锋利;
例句:
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Man sharpens man, the way steel sharpens steel.
来自SA
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The use of Gilbert's method sharpens our field observations.
吉尔伯特方法的应用使我们的观测结果更具有说服力.
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Mr Weaver talks with her while she sharpens her pencils.
她一面削尖铅笔,韦佛先生一面跟她谈话.
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Cold weather sharpens the pain in my knee.
寒冷使我膝盖的疼痛加剧.
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The consideration of a textual crux in itself sharpens the wits.
来自E. Dowden
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But everyone sharpens at a different angle.
来自THETIMES