1. They encountered numerous difficulties in conducting the experiment.
    他们在做这项实验时碰到了许多困难。

2. Those birds have become more numerous lately.
    近来那种鸟变得越来越多了。

3. numerous

3. He has a numerous collection of stamps.
    他收藏着许多邮票。

1. 数目众多的：neutral中间的 ,浅色的;无色的,非彩色的 | numerous数目众多的 | numerical数字的;数字上的;表示数字的;以数字表示的

2. 许多的：since =自...以来; | numerous =许多的; | scientific=科学的;

3.

3. 众多的：numeroscope 数字记录器 | numerous 众多的 | numerously 多数地

4.

4. 众多的,无数的：nuisance 麻烦事,讨厌的人(事) | numerous 众多的,无数的 | nursery 托儿所

1. 众多的;许多的
    If people or things are numerous, they exist or are present in large numbers.

    e.g. Sex crimes were just as numerous as they are today...
           当时性犯罪和现在一样多。
    e.g. Despite numerous attempts to diet, her weight soared.
           尽管多次尝试节食，她的体重仍然飙升了。

1. amounting to a large indefinite number

    e.g. numerous times
           the family was numerous
           Palomar''s fans are legion

    Synonym: legion(p)