[mass noun]constant or close attention to what one is doing 勤奋,刻苦;孜孜不倦,专注 assiduity with which he could wear down his opponents. 他那足以拖垮对手的刻苦精神。 ■[count noun](assiduities)(archaic or poetic/literary)constant attentions to someone (古 诗/文)殷勤
语源
late Middle English : from Latin assiduitas, from assiduus 'occupied with' (see assiduous)