如果这个方法奏效的话，它能给博茨瓦纳以及其他地区的农民提供一种低成本、可持续的手段去保护牲畜，同时也能避免狮子被杀死。
If the method works, it could provide farmers in Botswana—and elsewhere—with a low-cost, sustainable tool to protect their livestock, and a way to keep lions safe from being killed.
我们的课程总共囊括了二十种不同语言的内容，总时长达两万个小时，这保证你能学到可立即使用的语言技能。
Our courses, totalling 20,000 hours of content in 20 different languages, guarantee you language skills you can use right away.
宾西法利亚的研究人员决心专门设计更加节能的建筑——这一切都源自于能效更高的照明和可制热制冷的窗户。
The folks in Pennsylvania have decided to focus on designing buildings that save more energy – everything from more efficient lighting and windows to heating and cooling.
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