I heard the tramp of the marching soldiers.我听见了行军士兵重重的脚步声.They've had their marching orders.他们已经收到了辞退的通知。This is the unsounded purple sea of marching billows.这是个浪涛滚滚的不安宁的华美的大海.The gallant John B. Gordon, at head of ...
Lustre is the integral effect of reflection and diffraction.色泽是反射和衍射的综合效果.Evidently diffraction, as well as interference, is a wave property.显然,衍射以及干涉是波特性.The diffraction method is appreciably lower than that of the spec...