匹配负载阻抗之传输线上无反射.No reflection will appear on a line with matched load.研究弱激光驻波场中的无反射势阱.The reflectionless potential well affected by a standing laser field is studied.光线被黑面吸收(而无反射).Light rays are absorbed by black surfaces...
从1066年到17世纪，狐狸一直被视为害兽。From 1066 to the 17th century the fox was looked upon as vermin.它们的祖先是被培养来捕猎害兽.Their ancestors were bred to hunt and kill vermin.对农民来说,野兔是一种害兽,因为它吃幼嫩的作物.To a farmer a rabbit is vermin because it eat...