Parallelism is a rhetorical device, which refers to a sentence composed of three or more phrases or sentences with similar meanings, the same structure or the same tone. Sometimes compound sentence with two or more sentences can also be called compound sentence.

Generally speaking, the use of parallelism can get a coherent effect; The parallelism is lyrical, the rhythm is harmonious, the emotion is full and the momentum is strong; Using parallelism to describe scenery can make the level clear, the description delicate and vivid.