Since I have been at this school we have had three headmasters.自从我们到这所学校以来已经有三位校长了.Order and discipline have been placed in the hands of headmasters and governing bodies.维持秩序和纪律的工作已交接给了校长和管理机构了。There is a trend for knock...
将一张黑白底片冲印到彩色相纸上会产生相似的单色效果。Printing a black-and-white negative on to colour paper produces a similar monochrome effect.一般来说，单色的地毯使房间显得更宽敞。In general, a plain carpet makes a room look bigger.此材料必须对该激光器的单色辐射敏感.The material ...