1.易变的，反复无常的，易激动的 of a quickly changing, undependable nature, especially easily becoming angry or dangerous 2.（液体或油）易挥发的 (of a liquid or oil) easily changing into a gas
句型例句
用作表语
▲ S+be+～
With the markets being so volatile, investments are at great risk.由于市场那么变化不定，投资冒着很大的风险。 Gasoline is volatile.汽油易挥发。