"Less than" 是表示数量少于某个数的短语，常用于数学和统计学中。这个短语的来源是英文中的 less 和 than 两个单词的组合。less 意为 "更少的"，than 意为 "比"。
例句：
The number of attendees is less than 100. (参加者的人数少于100人。)
The temperature is less than freezing. (温度低于冰点。)
The price is less than half of what it was last year. (价格比去年低了一半。)