纷繁的英文：
numerous and complicated

参考例句：

The treaty stipulations are multifarious
约规纷繁

This throng of business
纷繁事务的这种压力

I don't like the rush of city.
我不喜欢纷繁忙碌的城市生活。

The moods were many and transient
心绪纷繁但往往如过往烟云

Further, we provide plenty of means for the mind to refresh itself from business.
此外，我们提供多种方法，使人从纷繁的事务中恢复身心清新。

Shanghai Peking Opera House formed its unique diversified style with embracement of various schools and pool of talents.
上海京剧院形成了其独特的艺术风格，以海纳百川之气概，聚成人才荟萃、剧目纷繁之大观。

numerous是什么意思：
adj. 众多的；许多的；数不清的

The numerical symbol0; a cipher.
0数字符号0；零

For conservationists, the material has numerous benefits.
在环保人士眼里，这种新材料具有很多优点。

The beehives consist of numerous cells.
蜂巢是由无数的小窝所组成的。

Our own numeral system is an example of a positional numeral system with base 10
我们现在所用的数系就是以10为基的定位数系。

Map this number to the Roman numeral system.
将这个数字映射到罗马数字系统。

complicated是什么意思：
adj. 结构复杂的

The sceptic knows that life is complicated.
怀疑论者却深知人生是如此错综复杂、扑朔迷离。

Involved or intricate, as in structure; complicated.
复杂的在结构中牵扯较多的或错综复杂的；复杂的

There is no need to complicate matters.
没有必要使问题复杂化。

What a complicated queue!
好复杂的一张表啊！

This dance step is quite complicated.
这个舞步挺复杂的。