The word 思路 (sīlù) is a compound formed by combining the character 思 (sī), meaning "to think" or "thought", with 路 (lù), meaning "road" or "path". It is a metaphorically constructed concept where the "path" or "way" (路) of one's "thinking" (思) is visualized as a route or channel, thus collectively meaning "train of thought", "line of reasoning", or "thinking logic". This formation follows a common pattern in Chinese where two meaningful characters are joined to create an abstract noun that describes a mental process or method, with the second character often providing a structural or metaphorical framework for the first.