他用铅笔做了记号。He made marks with a pencil.合上书以前,她小心地做了记号.She was careful to mark her place before she shut the book.他把手稿通读了一遍,并在不同意的地方标了记号.He read through the manuscript and marked it up with his objections....
Oxidation - reduction reactions are important in the solubilization and precipitation of iron and manganese.氧化还原反应在铁和锰的增溶和沉淀中具有重要作用.manganese peroxide二氧化锰The variety of garnet includes almandine, pyrope, magnesium - iron...