它们有锐敏的听觉、嗅觉和视觉。

They have good senses of hearing, smell, and sight.

达尔文是一位锐敏的观察家、准确的记录员、孜孜不倦的收藏者。

Darwin was a keen observer, an accurate reporter, and an indefatigable collector.

惟知跃进，惟知雄飞，惟知其本身自由之精神，奇僻之思想，锐敏之直觉，活泼之生命，以创造环境，征服历史。

All they need is to leap forward, to fly, to know freedom of spirit, elaborate thoughts and lively life for themselves, so they can create circumstances and conquer history.

几十年来，女性一直被告知雌激素结合孕激素服用，不仅能缓解更年期阵发性发热感、失眠症，而且能帮助保持骨骼强度、心智锐敏，而最重要的是有益心脏健康。

Women had been told for decades that estrogen taken with progestin would not only ease hot flashes and insomnia but help preserve bone strength, mental acuity and, most important, heart health.