「Orifice central」suggests the many sounds of QUEEFING in a roomful of females with stout dildos all in rapid use, the lord's harem full of bored concubines.
　「Orifice with quick glance」: hearing an infant burping up milk deserves a quick glance to be sure the child does not drown in its own vomitus, or to wipe it up after pulling the wraps open with both hands to look inside…the same may apply when overhearing some QUEEFING.
　Hearing an ECHO may also cause someone to quickly look around for the source of sound and form a conclusion. Be that as it may, an ECHO is the repetition of one sound, the same sound twice or more in succession, and infants make very little if any sound while spitting up in many cases, with the expelled milk often simply overflowing from the mouth without any retching after being filled to beyond rated capacity. But a QUEEFING series of pussy farts on the other hand is definitely the same sound twice or more in succession, in most cases.
　So, perhaps a different sort of stinky, sticky, milky flow that is associated with sounds emanating in repeated succession from a young child, but not an infant sucking teat or the child's mouth, issued from the「central orifice」where these flows all have been collected. With no meanings listed from the external Chinese source, it is likely that this latter understanding is not far from the mark, and was censored…the central part of any mouth does not necessarily produce an echo or infant vomit for that matter, but PUSSY FARTS and related purring sounds are the repercussions, echoes of a just-completed activity, the GURGLING SOUNDS that may resemble a baby sputtering and disgorging excess milky-like content.
　「In traditional Chinese medicine, there has never been a mental disease called pedophilia (or an equivalent term), or homosexuality, or most of the other so-called sexual variations for that matter [such as, aggressive masturbation with a stout dildo]. …Children are usually described as natural sexual beings and erotic stimulation and sex-play are seen as beneficial to their healthy development.」
　　[　https://docx2.com/wp-content/uploads/Are-Any-of-the-Pharaphilias-in-DSM-Mental-Disorders_.pdf 2023-05-14　]　
　Without a doubt, the Irish also have knowledge of their own to pass along in these trying times:「Masturbation will not spread coronavirus, especially if you wash your hands (and any sex toys) with soap and water for at least 20 seconds before and after.」Nonetheless and regrettably, unlike in dynastic China, it must be undertaken alone to truly be a preventative countermeasure but still achieve the desired result with some degree of safety.
　 　[　https://www.sexualwellbeing.ie/sexual-health/sex-and-coronavirus/ 2020-03-31　]　
　The Dutch, too have the same solution—it seems masturbation has become mainstream in the media the world over due to the coronavirus (it has always been 'the main stream' in reality, albeit covertly for most folks):
　「'Don't have sex with your partner if they have been isolated because of (suspected) coronavirus infection,' the RVIM says. 'Sex with yourself or with others at a distance is possible (think of telling erotic stories, masturbating together).'」
　　[　https://www.theguardian.com/world/2020/may/15/dutch-official-advice-to-single-people-find-a-sex-buddy-for-lockdown-coronavirus 2020-05-16　]　
　Needless to point out perhaps, but Chinese shamans from antiquity hit upon the same solution as a pandemic preventative countermeasure, honed for ultimate client satisfaction by utilizing naked females with no-longer-integrated feet as masturbatory sex buddies available for short-term rental with erotic visualization of live prepubescent female genitalia engaging in autoerotic stimulation herself, as a solution to the same problem facing us now, but in pre-Internet days.

Modern definitions (that generally disregard history) …excluding politically incorrect concepts and other meanings deemed offensive today; may list only pigeonholed definitions, euphemisms, or meaningless mnemonics)
Unihan extended: an echo, a sound to vomit, as an infant
EDRDG: an echo; sound; to vomit (as an infant)