这种感觉是敏锐的，对细节很敏感。

The sense is ___keen, attuned to detail.

他对学习新语言充满热情。

He is ___keen on learning new languages.

她对细节有着敏锐的洞察力。

She has a ___keen eye for details.

她对学习新语言有着强烈的兴趣。

She has a ___keen interest in learning new languages.

这把剪刀的锋利刀刃可以轻松剪开纸张。

The ___keen edge of these scissors cuts paper easily.