网络速度缓慢,请稍等......   
修改短文遵循四个原则

(1)Unity;
(2)Support; 
(3)Coherence;
(4)Sentence skills.
If you advance a single point and stick to that point, your paper will have unity; if you support the point with specific evidence, your paper will have support; if you organize and connect the specific evidence, your paper will have coherence; if you write clear, error-free sentences, your paper will demonstrate effective sentence skills.
 
——摘自《美国大学英语写作》