科研选题与论文写作4论文写作中常出现的问题.ppt

句子的连接和信息的传承 使文章紧凑和连贯要注意两个方面： 内容: 信息，要连贯 用好连接词和连接用的副词 There is increasing interest in natural antioxidant products for use as medicines and food additives. Vitamin C, vitamin E and carotenoids are some of these widely used natural antioxidants . Reactive oxygen species (ROS) including superpxide anion radical, hydroxyl radical and hydrogen peroxide, are generated under physiological and pathological stresses in human body. 第一句和第二句都与 natural antioxidant有关，但第三句出现了reactive oxygen species,同前面的内容没什么关系,这时第三句同前面的传承上出现了断离.下面的改 动中加了个连接句子，把 natural antioxidant 和 reactive oxygen species 连 接了起来 . There is increasing interest in natural antioxidant products for use as medicines and food additives. Vitamin C, vitamin E and carotenoids are some of these widely used natural antioxidants . Antioxidants played an important role in lowering oxidative stresses caused by reactive oxygen species (ROS). ROS including superpxide anion radical, hydroxyl radical and hydrogen peroxide are generated under physiological and pathological stresses in human body. 从一个状况到另一个不相 关 的状况 时 ， 经常 用in addition to 的句子衔接 . Oxygenases catalyze the incorporation of a molecule of oxygen (O 2 ) into the substrate. They catalyze the initial and rate-limiting step of L - Trp catabolism in the kynurenine ( Kyn ) pathway. ……….. In addition to its role as a L - Trp-catabolizing enzyme, IDO is involved in the immuno -regulating system……… 复杂句中的短语之间需要用连接词和副词来连接。 同时句子之 间的传乘也需要使用连接词和副词 . And, but, or, for, nor, yet, not only…but also, either…or, although, after, before, because, if, as, when, since, than, where, unless, though, whereas 都是些经常使用的连接词 . 连接副词，如 also, however, moreover, furthermore, therefore, otherwise, consequently, indeed, similarly, finally, likewise, then, hence, nevertheless, thus. 简单句和复杂句 当用连接副词来连接两个独立的句子时，一般语法书中都注明第一个句子后加分号，连接词 后加逗号. 但现代杂志论文中往往在第一个句子后加句号,而不用分号，两种写法都是可以接受的 . We quantified the extent of forest damage in the region; moreover , we attempted to explain why trees died. We qu