Steamers tooted at us as sailors on deck waved in amusement.汽船向我们嘟嘟鸣笛时，甲板上的水手们饶有趣味地挥着手。The lower reaches of the river are navigable for steamers.这河的下游能够行驶轮船.These steamers are used for conveying passengers on the rivers....
《洁净水法案》1977年的修正案,是这些问题的派生物.The 1977 amendments to the Clean Water Act were an outgrowth of these problems.最初的源头生成了几个派生物.There were a few derivatives obtained from the original source.为什么白金雀儿碱的派生物是苦的?WHY ARE THE LUPANINE ...