What we find is that the monarchs strongly prefer the medicinal milkweed.

我们帝王斑蝶偏好药性乳草。

The problem is there are different types of milkweed.

问题是乳草有很多种类。

Young butterflies in the form of caterpillars depend on milkweed.

毛毛虫形状的小蝴蝶以马利筋为食。

Decker say these findings are not just about butterflies and milkweed.

德克尔表示，这不仅仅与蝴蝶和马利筋有关。

" There are things people can do to help, " she said, including planting milkweed.

“人们可以一事情来帮助它们，”她说，包括种植马利筋。

Drier weather in the U.S. West, driven by climate change, means less milkweed for butterflies to eat, Wagner said.

格纳说，受气候变化影响，美国西部气候更加干燥，这意味着可供蝴蝶食用的乳草减少。

It is important to choose the right kind of milkweed.

选择正确的马利筋种类是很重要的。

She said not all milkweed is the same.

她说，并不是所有的马利筋都是一样的。

At her Virginia home, Katherine Dietz already grows three types of native milkweed, food for hungry monarch caterpillars.

凯瑟琳·迪茨在弗吉尼亚州的家中已经种植了三种本地乳草，它们是饥饿的帝王毛虫的食物。

At her Virginia home, Kathryn Dietz already grows three types of native milkweed, food for hungry monarch caterpillars.

在她弗吉尼亚州的家中，凯瑟琳·迪茨已经种植了三种当地的乳草，这是黑脉金斑蝶幼虫饥饿时会吃的食物。

To help increase the habitat for monarchs and other species, scientists recommend planting native milkweed alongside other nectar producing flowering plants.

为了帮助增加黑脉金斑蝶和其他物种的栖息地，科学家建议与其他产蜜的开花植物一起种植当地的马利筋。

One of the quickest and best ways to help is to plant milkweed on your property.

最快以及最好的帮助方式之一是在你的土地上种植马利筋。

The big one is the milkweed.

最大的是乳草。

In other words, what these females are doing is they're laying 68 percent of their eggs in the medicinal milkweed.

换句话说雌蝶把 68％ 的卵产在药性乳草上。

Monarchs lay their eggs on milkweed plants.

帝王蝶在乳草植物上产卵。

And the female Monarch will lay its eggs only on milkweed.

而雌性帝王蝶只会在乳草上产卵。

With the use of pesticides the amount of milkweed has really declined.

随着杀虫剂的使用，马利筋的数量确实减少了。

To find the right kind of milkweed, you can use the National Wildlife Federation's Native Plant finder.

要找到合适的马利筋，你可以使用国家野生动物联合会的本地植物查找器。

She persuaded the school to add milkweed to the garden to attract butterflies.

她说服学校在花园里种植马利筋以吸引蝴蝶。

Planting tropical milkweed in the United States is a problem because it is not native to the country.

在美国种植热带乳草是一个问题，因为它不是这个国家的原产植物。