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LingakuLingaku[clause A], + [clause B with the same structure]
对仗 pairs two phrases or clauses of the same length and the same structure, so each word in the first half has a partner in the second: verb with verb, number with number, noun with noun. The partners are usually opposites or close relatives in meaning. It comes from classical poetry and the couplets pasted on doors at New Year, and modern writing uses it in slogans, headlines, speeches and the line that sums up an essay.
Lined up, the two halves match slot by slot. In 读万卷书，行万里路, 读 pairs with 行, 万卷 with 万里, 书 with 路.
Writers build their own pairs with repeated frames. 多一分…少一分 and 有…才有… are common ones.
A run of three or more matching clauses is 排比, which piles up for emphasis.
English writers vary their wording so as not to repeat themselves. In 对仗 the repetition is the point, and a half that breaks the frame sounds lopsided.