The Chinese word **胸膛** (*xiōngtáng*) is a compound noun formed by combining two semantically related characters: **胸** (*xiōng*), meaning "chest" or "breast," and **膛** (*táng*), which refers to an "enclosed space" or "chamber" (like the chest cavity or the bore of a gun). Together, they create a more vivid and specific term than either character alone, where **膛** acts as a semantic intensifier that emphasizes the chest as a hollow, interior vessel—often metaphorically associated with the seat of emotions, courage, or the heart. This formation follows a common pattern in Chinese where two synonyms or related morphemes are combined to express a single, nuanced concept.