什么是run-on sentence
Obviously, the problem of greenhouse effect is one of the biggest problems that had many big conferences between countries to discussed it today, the movie is just magnifying the effect of this problem in order to lead the reason of this clime disaster more believable.
Moreover, before the main catastrophe happened in THE DAY AFTER TOMORROW there are many small disasters appeared in the movie, like hail and cyclone which could be seen in the normal life, that let the story more closed to people’s experience and give the audience more soul shock than 2012.
In 2012, the communication between the people is not enough, the main action in this story is just run--- run on foot, run by car, run by plane and at last run by a huge ship.
请问这几句有什么问题，老师说我是run-on sentence。但我没看出具体的问题在哪，要怎么修改呢？
run-on sentence为一种化学现象，又称增效作用，是指两种或两种以上的组分相加或调配在一起，所产生的作用大于各种组分单独应用时作用的总和。而其中对混合物产生这种效果的物质称为增效剂(synergist)。
协同效应常用于指导化工产品各组分组合，以求得最终产品性能增强。
run-on sentence作用：
生产上开发的增产菌，就是基于这一作用而来，除能控制作物病害导致间接增产之外，其本身还可产生激素，增强植物的光合效力，提高其抗逆性和延缓衰老，直接使植物增产。是对人、畜和环境安全，促进农业生态良性循环的植病生防手段。
传播学认为，在小群体语境下，更多的人可以为群体的目标做出贡献，在解决问题的群体或完成任务的群体里，多种看问题的视角具有优势，这种小群体从多种视角交换中获得好处被称作增效作用（synergy）。
经济学上的增效作用：
增效作用（Synergy） 因收购而产生的额外价值，就称为增效作用(Synergy，协同效应)。增效作用可以表现为成本的节约，也可以表现为知识和技能的有效结合和传播，比如两家公司结合之后，可以生产出之前两家公司单独无法生产的产品。当然，这类的增效作用的效果是很难衡量的。
run-on sentence为一种化学现象，又称增效作用，是指两种或两种以上的组分相加或调配在一起，所产生的作用大于各种组分单独应用时作用的总和。而其中对混合物产生这种效果的物质称为增效剂(synergist)。
协同效应常用于指导化工产品各组分组合，以求得最终产品性能增强。
内涵
化学领域的双金属或多金属协同效应，指的是掺杂两种或多种金属产生的性能高于其任何一种成分单独存在时产生的性能。这些性能可能指化学性能。比如催化活性，或者催化寿命的提高。普遍认为催化协同效应的产生是源自混杂多于一种活性金属；或是给质子位置的产生；或者是纳米颗粒上表面形貌的改变造成的电子结构的改变。
如一个亚基与其配体结合后，能影响另一亚基与配体结合的能力。(正、负) 如血红素与氧结合后，铁原子就能进入卟啉环的小孔中，继而引起肽链位置的变动。 变构效应: 蛋白质分子因与某种小分子物质 （效应剂）相互作用而致构象发生改变， 从而改变其活性的现象。
本回答被网友采纳The mere fact that a sentence is long does not make it a run-on sentence; sentences are run-ons only when they contain more than one complete idea. A run-on sentence can be as short as four words—for instance: I drive she walks. In this case there are two complete ideas (independent clauses): two subjects paired with two (intransitive) verbs. So long as clauses are punctuated appropriately, a writer can assemble multiple independent clauses in a single sentence; in fact, a properly constructed sentence can be extended indefinitely.
简而言之，run-on sentence是指句子之间或独立子句之间句号省略而标点错误的句子。
说白了，就是在英语中不能用逗号连接两个句意及结构都完整的独立的句子。
该用句号的地方，你用的是逗号。
参考资料：From Wikipedia, the free encyclopedia
本回答被网友采纳两个句子的连接必须用连词或者是分号，用逗号来连接两个句子只能是分句，不是主句。
A run-on sentence is a sentence in which two or more independent clauses (that is, complete sentences) are joined with no punctuation or conjunction.
修改如下：
Obviously, the problem of greenhouse effect is one of the biggest problems that had many big conferences between countries to discussed it today,（这里应该用句号或分号，连接两个完整的句子） （用句号时大写The）the movie is just magnifying the effect of this problem in order to lead the reason of this clime disaster more believable.
Moreover, before the main catastrophe happened in THE DAY AFTER TOMORROW there are many small disasters appeared in the movie, like hail and cyclone which（避免重复可用that） could be seen in the（去掉the，平常生活中in ordinary life） normal life, that（非限定性定语从句用which引导）let the story（缺少谓语动词be或不妨用“makes+形容词”结构更恰当） more closed to people’s experience and give（与前makes并列，用单三形式gives） the audience more soul shock than 2012.
In 2012, the communication between the people is not enough, （逗号可改为冒号：或破折号——表示其后的句子解释说明）the main action in this story is just run--- run on foot, run by car, run by plane and at last run by a huge ship.本回答被提问者采纳