在编程中，'变量'的主要作用是什么？

Choose the correct tense for the sentence: 'Scientific work ______ on specific aspects of a phenomenon.'

The seemingly effortless elegance of the dancer's performance masked years of rigorous training and meticulous attention to detail. This underscores that true mastery in any discipline often involves not only inherent talent but also a deep understanding of its underlying principles and a relentless dedication to the _____, despite their often being invisible to the casual observer.

在数论中，快速数论变换(NTT)与快速傅里叶变换(FFT)相比，主要优势是什么？

以下哪项是孩子成长过程中最关键的需求之一？