【化】 piroheptine
second
【建】 acetonitrile; ethane nitrile
armour; first; nail; shell
【医】 carapace; concha; conchae; helo-; nail; onycho-; onyx
【化】 pentazane; pyrrolidine; tetrahydropyrrole
【医】 pyrrolidine
on behalf of; replace; take the place of
circles; forest; woods