Today, he had received his small gratuity , as usual.这次他也得到了他的赏钱.The porter expects a gratuity.行李员想要小费。He is taking a gratuity from the Navy.他将领到海军补助的退役金。...
氧化还原反应在铁和锰的增溶和沉淀中具有重要作用.Oxidation - reduction reactions are important in the solubilization and precipitation of iron and manganese.有机物 、 褐铁矿和氧化锰的含量影响着成矿元素含量的变异.The contents of organic material, limonite and manganese hy...
These optical fibres may be used for new sorts of telephony.这些光缆可以用于新型电话通讯系统。All sorts of colours will result as these flowers hybridise freely.这些花自由杂交后会产生各种各样的颜色。It takes all sorts to make a world.万千事物，形成世界。He made a li...