香水含有许多易挥发的成分，所以瓶盖要盖紧。

Perfumes contain many ___volatiles, so the cap should be tightly closed.

近期股市波动剧烈，投资者纷纷减持高风险资产以规避市场的不稳定因素。

Traders are reducing exposure to high-risk assets to avoid the ___volatility in the current stock market.