<<< native
[ EText
    TextNormal "Inline updown arrows, text style, normal line\160"
, EDelimited
    ""
    ""
    [ Left "\8597"
    , Right
        (EFraction
           NormalFrac
           (EGrouped
              [ EMathOperator "sin" , ESymbol Ord "\8289" , EIdentifier "\952" ])
           (EIdentifier "M"))
    , Left "\8597"
    ]
, EText TextNormal "\160the end."
]
>>> eqn
roman "Inline updown arrows, text style, normal line " left "" "↕" {sin  theta} over M "↕" right "" roman " the end."