经过几个月的锻炼，他的体能有了明显的提升。

After months of training, there was an appreciable improvement in his physical fitness.

appreciable 是由动词 appreciate（欣赏、感激）加上形容词后缀 -able 构成的形容词，表示"可感知的、明显的"。在句中指体能提升的程度足够大，能够被明显察觉到。