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1·The Washington Post reported, one of the main reasons, experts say, is that farmers have used herbicides on the milkweed plants that these butterflies feed on.

《华盛顿邮报》报道，专家说，主要原因之一是，农民对马利筋植物使用除草剂，而这些蝴蝶以马利筋植物为食。

2·Caterpillars of monarch butterflies feed exclusively on milkweed leaves.

黑脉金斑蝶的毛虫只吃马利筋的叶子。

3·Maize pollen is dispersed by the wind and often blows onto milkweed plants that grow near maize fields.

玉米花粉被风吹散，经常吹到生长在玉米田附近的乳草属植物上。

4·The specific glycosides present in milkweed differ from region to region within the monarch butterfly's range.

马利筋中的特殊糖苷在帝王蝶的范围内因地区而异。

5·When, in experiments, these caterpillars were fed milkweed leaves dusted with pollen from modified maize plants, they died.

在实验中，这些毛毛虫被喂食沾有转基因玉米花粉的马利筋叶子，然后它们死亡了。

6·Being milkweed, it sent more shoots right back up.

作为顽强的，屡败屡战的马利筋，它立刻就生发出更多的笋芽，妄图卷土重来。

7·The tarantula hawk wasp feeds on milkweed pollen.

一只沙漠蛛蜂正在吞食马利筋的花粉。

8·Overall, a monarch butterfly is no more or less striking than its host, the milkweed pod.

总的来说，帝王蝴蝶和其宿主奶草豆荚的漂亮程度是差不多的，既不多一分，也不少一分。

9·This is because their staple food, milkweed, is being used more and more as a garden ornament.

这是因为它们的主要食物乳草被越来越多的用于园林装饰。

10·one says at the Monarch Club, “Mrs Jones of Acacia Drive, Bermuda, has planted milkweed. Fancy a bit?

也许在君主蝶聚会的时候其中一只会说：“嘿，伙计们，百慕大阿卡西亚大街的琼斯夫人家刚种了乳草，有兴趣去来一口吗？”