TP Patterns的用法和样例：
例句
- TP chain refers to the linear sequence formed through the combination of two or more common TP patterns.
摘要主位推进模式链是指由两种及其以上常见的主位推进模式组成的序列。 - To express complicated ideas, text producers often make use of TP chains to promote and develop English scientific and technical texts.
为了表达复杂的思想，语篇生产者往往采用主位推进模式链来推进和发展英语科技语篇。
