This structure demonstrates an Independent Clause (IC). An IC is grammatically complete: it requires a Subject and a Verb, and it expresses a complete thought. Analogously, this is a fully functional train car. It can move on its own. The adverbial phrase simply adds detail. 这个结构展示了一个独立分句 (IC)。 一个IC在语法上是完整的：它必须包含一个 主语 和一个 谓语, 并且它表达了一个完整的意思。 就像一节功能齐全的火车车厢，它可以单独运行。 状语短语 只是增加了细节。
新挑战: 当两个相关IC（车厢）需要连接时，必须使用正确的机制——连接器 (Coupler)，以避免句子跑题或逗号拼接错误。 New Challenge: When two related ICs (train cars) need connection, they must be linked by the appropriate mechanism—the Coupler—to avoid run-on sentences or comma splices.