n.燕子尾巴；燕尾服；燕尾形旗子的末端
A magnified shot shows the head of a tiger swallowtail butterfly larva. 这个放大的照片显示一只凶猛风蝶幼虫的头部。
A swallowtail butterfly was resting in a snow cup.The scene held us for some time. 一只燕尾蝶停留在一个雪杯里，这幅景象吸引了我们。
