波纹铁屋顶a corrugated iron roof她在这个词的下面画了一条波纹线.She drew a wavy line under the word.深水池中水的表面能产生波纹.Ripples are generated on the surface of water in a deep pond....
Our tour departs from Heathrow Airport on 31 March and returns 16 April.我们这次旅行于3月31号从希思罗机场出发，4月16号返回。Your deposit matures on April 3 rd.你的存款四月三日到期.The store must clear its winter inventories by April 1 st.该店必须在4月1日前售清冬季存...