小型望远镜a small telescope (= a cylinder-shaped device for making objects that are far away look closer and larger, using a combination of lenses, or lenses and curved mirrors)
Through a spyglass, he saw a heavily defended fort. 通过望远镜，他看到了一个防守严密的堡垒。
She heads to the roof every day with the family spyglass, to keep watch for planes. 她每天拿着家里的望远镜去屋顶看飞机。