Chengdu Chinese, a prominent branch of Southwestern Mandarin known as Sichuanese, is closely related to Standard Mandarin but features distinct differences in phonology, vocabulary, and tones. While the two are often considered mutually intelligible for those with a strong grasp of Mandarin, the most striking variation lies in pronunciation; specifically, Sichuanese speakers typically avoid retroflex sounds, causing characters like "shi," "chi," and "zhi" to merge into "si," "ci," and "zi." Additionally, the tonal contours of Chengdu's dialect are significantly different, often rendering rapid speech unintelligible to outsiders, and the dialect employs unique vocabulary such as "bashi" (good/comfortable) and "yaodei" (okay). Despite these linguistic divergences, the written form remains identical to Standard Mandarin, and most residents in Chengdu are bilingual, allowing them to switch to Standard Mandarin to accommodate travelers and formal situations.