【化】 carbethoxy; ethoxycarbonyl
second【建】 acetonitrile; ethane nitrile
oxygen【医】 o; O2; oxy-; oxygen; oxygenium; phlogisticated gas
armour; first; nail; shell【医】 carapace; concha; conchae; helo-; nail; onycho-; onyx
【机】 hydrazide; ureides