rarefy [rare a. 稀薄的；-fy=>“to make rare 使稀薄”→]vt. make less dense 使稀薄，使稀少/ The air on high mountains is rarefied. 髙山上空氣變稀薄了。

rarefication n. 稀??；純化，純凈

下面，我們介紹詞根與-fy結(jié)合成的3個動詞。

fortify [ fort = strong 強(qiáng)的；-ify=>“to make strong 使變強(qiáng)→]v. strengthen against attack 增強(qiáng)（陣地）；設(shè)防 / The soldiers fortified their position by building earthworks. 戰(zhàn)士們構(gòu)筑土木工事加強(qiáng)自己的陣地。

fortification n. 設(shè)防；設(shè)防陣地；筑城；筑壟；筑城學(xué)

identify [ ident = same 同一的；-ify→] v. ① cause to be the same; treat as the same 使等同于；同等對待 / A good king should identify the well-being of the people with his own. 好國君應(yīng)將百姓的幸福視同己身的幸福。②prove to be the same鑒定，認(rèn)出 / He indentified the wallet as his by telling what it contained. 他說出錢包里裝的東西，證明它是自己的。

identification n. 認(rèn)出；鑒定；驗(yàn)明；身份證明

petrify [ petr = stone 石；-ify=>“to cause to be a stone 使變成石”→] v. ① turn into a stone 使石化 / There is a petrified forest in Arizona in America. 在美國的亞利桑那州有一片石化林。② paralyze with fear or surprise 使（因驚慌等）發(fā)呆/ The girl was petrified as the snake came near. 當(dāng)蛇爬近身邊時，那女孩嚇呆了。

petrification, petrifaction n. 石化作用；發(fā)呆

stupefy [ stup = amazed 受驚的；-efy =>“to cause to be amazed 使受驚”→]v. ① overwhelm with amazement or shock 使驚得發(fā)呆/ They were stupefied by the calamity.他們被災(zāi)難驚鎮(zhèn)住了。② make stupid or senseless使麻木；使失去感覺/ He was stupefied by the drug. 他被那藥物麻醉了。

stupefaction n. 麻木狀態(tài)；昏迷

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