1. Clusters of tiny insects called aphides were to be found on the underside of the leaves.
    在树叶阴面，可以发现一簇簇叫做蚜虫的小昆虫。

2. Clusters of tiny insects called aphides were to be found on the underside of the leaves.
    在树叶阴面，可以发现一簇簇叫做蚜虫的小昆虫。

3. Clusters of tiny insects called aphids were to be found on the underside of the leaves.
    结果在树叶背面找到成串的叫作蚜虫小虫子。