次亞硫酸鈉

sodium hyposulfide Na2S2O3 (hypo)

next in sequence / second / the second (day, time etc) / secondary / vice- / sub- / infra- / inferior quality / substandard / order / sequence / hypo- (chemistry) / classifier for enumerated events: time

Asia / Asian / Taiwan pr. [Ya3]

second / next to / inferior / sub- / Taiwan pr. [ya3]

sulfur (chemistry)

sulfurous acid H2SO3

sulfuric acid H2SO4 / sulfate

sour / tart / sick at heart / grieved / sore / aching / pedantic / impractical / to make sarcastic remarks about sb / an acid

sodium sulfate

sodium (chemistry)