同性的电荷互相排斥.Two like electric charges repel each other.我们时常把电荷的流动比喻为水的流动.We often compare the flow of electrical charges to the flow of water.这是因为唱片和麦片会有相反的电荷.This is because the record and the cereal have opposite charges...
LouisL'Amour路易斯.拉穆尔.I only wish they had louder voices.摘要过度放牧和旅游践踏导致了希拉穆仁草原严重的退化、沙化.Over - grazing and tourist visitation are causing degeneration of the grassland in the Xilamuren area.这就为进一步合理开发、利用希拉穆仁草原提供了有力的依据.I...
A report compiled by the Fed's Philadelphia branch described the economy as weak.一份由联邦储备银行的费城分部汇编的报告说经济不景气。There are several reference books which have been compiled to help you make your choice.有几本参考书专门帮你作出选择。She h...