大卫·瓦林格认为美国农业部应该采取什么行动来实现粮食安全？
What should the USDA do to achieve food security according to David Wallinga?
然而，如果古加瓦的语言和其他类似的语言想要继续存在下去，写作可能必须成为他们生活的一部分。
However, if Guujaaw's language and others like it are going to stay alive, writing may have to become part of their lives.
保持手机在待机状态下作业至少需要20毫瓦电力，但是诺基亚希望电源收集最终可以提供50毫瓦电力，足够给一部手机缓慢充电。
It takes at least 20 milliwatts to keep a mobile phone operating in standby mode, but Nokia hopes that power scavenging might eventually deliver 50 milliwatts, enough to trickle-charge a phone.
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