than连起来意思是“少于，不多于”，中间加形容词表示比较级。
less than的用法
1、less than 后面接形容词、副词时,意为不;很少;不到,具有否定意义。例句：
(1)We were busy and less than delighted to have company that day.
那天我们很忙,不高兴有客人来。
(2) The young man is less than twenty years old.
这个年轻人不到 20 岁。
2、less than 意为不像;不是。
例句：
Joseph is less honest than his brother.
约瑟夫不像他兄弟那样诚实。
Less than的相关搭配
1、no less than不亚于，竟达??之多例句：
The audience was no less than five thousand. 听众有五千人之多。
That hotel probably costs no less than 20 dollars a night.
那间旅馆的住宿费大约要20元一晚呢。
2、no less .. than不少于,不亚于
例句：
He is no less a person than a minister他的身分不亚于部长。
3、not less than不比??差，至少
例句：
I'll stay here not less than three days. 我将待在这里至少三天。
4、not less...than至少和?一样
例句：
She is not less beautiful than Mary她至少和玛丽一样美丽。
5、no/not any less
例句：
Are we all not any less than 50th cousins?