fluid n．流動性，流度 adj. 流動的
例句：Air is a fluid but not a liquid, while water is both afluid and a liquid.
空氣是流體不是液體，水是流體也是液體。

fluctuate v．變動．波動，漲落
例句：The price of vegetables fluctuates according to the weather.
蔬菜價格隨著天氣變化而波動。

fluent adj. 流利的，流暢的
例句：Daisy likes him all the better for his fluent spoken English.
正因為他操一口流利的英語，戴茜更愛他。

flush n．臉紅，激動
例句：Ellen shows a flush ofjoy at his coming.
對他的到來愛倫高興地臉紅了。

influence n．影響，感化 v．影響，改變
例句：Her parents no longer have any real influence over her.
她的父母對她不再有任何真正的約束力了。

influential adj. 有影響的，有勢力的
例句：Those facts were influential in solving the problem.
邢些事實對解決問題有重大的影響。

impact n．碰撞，影響，效果
例句：The plane flew into a mountain and disintegrated on impact.
飛機沖向一座山，撞得粉碎。

compact adj. 緊奠的，緊密的 n．契約，合同
例句：The Commonwealth agreed to make a compact with this country.
英聯邦同意和這個國家訂約。