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• battery is too low system shut
• battery is too low system shut
• 帮忙翻译下BBC文章Since 1999, researchers with the Elephant Listening Project have used an acoustic monitoring system to record elephant sounds in the African rainforest. They’ve learnt that elephants use infrasonic calls - calls too low in frequency to be heard by the human ear - for long-distance communication. Infrasound can travel farther than higher pitched sound. Elephant families separated by several kilometers use them to keep track of each other. Mal
• 5句陈述句改为反问句的练习
• 如图所示,在△ABC中,∠C=90°,∠A=30°,DE⊥AB,交AB于D,交AC于E,且CE=DE.那么DE是AB的垂直平分线吗?