VOA慢速英语:许多帝王蝶不飞往南方过冬

n. 流浪者; 游荡者; 落伍士兵; 蔓生的枝叶;
[例句]There were two stragglers twenty yards back
两名掉队者落后了20码。

2.habitat

n. 产地; （动物的） 栖息地，住处; 经常发现某种事物的地方;
[例句]Few countries have as rich a diversity of habitat as South Africa.
几乎没有哪个国家像南非那样拥有如此多样化的动植物栖生地。

3.pesticide

n. 杀虫剂，农药;
[例句]This pesticide is diluted with water and applied directly to the fields.
这种杀虫剂用水稀释后直接施用在田里。

4.milkweed

n. 乳草属植物;
[例句]In some angiosperm the seeds are equipped with gossamer wings, like the dandelion and milkweed seeds.
有些被子植物的种子有蛛丝般的翅膀，例如蒲公英和乳草属植物的种子。

5.caterpillar

n. 毛虫; 履带; 履带拖拉机;
[例句]A caterpillar changed into a butterfly.
毛虫变成了蝴蝶。