1·About 30,000 hectares of rice fields in Kerala are infested by this weed.
喀拉拉邦大约3万公顷的稻田大量滋生这种杂草。
2·The process of making organically rich compost produces heat. This heat kills many, though not all, weed seeds.
制造有机堆肥的过程会产生热量。高温杀死了很多杂草种子，虽然不是全部。
3·Eurasian watermilfoil, a weed not native to Frida Lake, has reproduced prolifically since being accidentally introduced there.
欧亚水草是一种不属于弗里达湖的杂草，自从被意外引进后，就大量繁殖。
4·For protection from the summer sun, the Mojave lived in open-sided, flat-topped dwellings known as shades, each a roof of poles and arrow weed supported by posts set in a rectangle.
为了躲避夏季的阳光，莫哈韦人住在遮荫的开放式平顶住宅里，每个遮阳棚都由一根杆子和一个箭头杂草组成，并由一个矩形的柱子支撑。
5·In order to eliminate the weed, biologists proposed treating infested parts of the lake with a certain herbicide that is nontoxic for humans and aquatic animals.
为了消除这种杂草，生物学家建议用某种对人类和水生动物无毒的除草剂来处理受感染的部分湖泊。
1·Becky Weed and her husband, David Tyler, raise sheep near Yellowstone National Park. They ranch with a guard dog to ward off coyotes, bears, and mountain lions.
贝基·威德和她的丈夫大卫·泰勒在黄石公园附件牧羊。他们养了一条牧羊犬，驱赶土狼、棕熊和美洲狮。