<<< native
[ EText TextNormal "Inline floor, auto, normal line\160"
, EDelimited
    "\8970"
    "\8971"
    [ Right
        (EFraction
           NormalFrac
           (EGrouped
              [ EMathOperator "sin" , ESymbol Ord "\8289" , EIdentifier "\952" ])
           (EIdentifier "M"))
    ]
, EText TextNormal "\160the end."
]
>>> tex
\text{Inline floor, auto, normal line~}\left\lfloor \frac{\sin\theta}{M} \right\rfloor\text{~the end.}