一些马蹄铁形蝙蝠能探测到细微至0.0001千赫的差别.Some Horseshoe bats can detect differences as slight as 0 . 0001 KHz.他们在旁边坐了100种渠道, 各200千赫宽.They sat aside 100 channels, each 200 kilohertz wide.这些无线电波以每秒15千赫的波长发出.These radio waves are coming ...
Investment could dry up and that could cause the economy to falter.投资可能会中断，而这会引起经济衰退。He bought an investment property for $100,000 and put down $20,000.他以10万美元买下一处投资性地产，并支付了2万美元的定金。The job needs someone with a good track...
An emoticon is a textual portrayal of a writer's mood or facial expression.符号表情)是书写者情绪或者面部表情的文字表现方式.We can use our eyes and facial expressions to communicate virtually every subtle nuance of emotion there is.我们用眼睛和面...