xī tīng
olefine
alkene (chemistry)
yǐ xī jī
vinyl
vinyl group (chemistry)
lǜ yǐ xī
vinyl chloride C2H3Cl
chloroethylene
jù sì fú yǐ xī
polytetrafluoroethylene (PTFE), trademarked as Teflon
dīng èr xī
butadiene C4H6
biethylene
huán wù xī
cyclopentene C5H8 (ring of five carbon atoms)
lǜ yǐ xī
vinyl chloride C2H3Cl
chloroethylene