volatileadj.不稳定的；反复无常的；易挥发的n.挥发物volatile fuel oil挥发性燃油Volatile profiles挥发组分volatile compound挥发性化合物volatile crystals挥发性结晶体volatile phenolic挥发酚volatile smelting挥发熔炼volatile covering挥发性覆盖层volatile impurity挥发性杂质volatile material挥发性物质volatile alkaloid挥发性生物碱