多年来，有一些恒定的因素使情人节特别适合那些可爱的女士。
Over the course of years, there have been some constant factors to make Valentine's Day special for those lovely ladies.
列提纲的具体技巧会根据文章的写作要求、体裁和字数而不同，但依然存在一些恒定不变的因素。
Tips for paper outline may vary in accordance with the discipline, type of paper and amount of work, but some things just don't change.
需求曲线表明当单位价格的变化保持在一个非价格因素的恒定值上时，多数消费者在多大程度上愿意掏腰包去消费。
The demand curve shows how much of a good consumers are willing to buy as the price per unit changes holding non-price factors constant.
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