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. 髙山上空气变稀薄了。
rarefication n. 稀薄；纯化，纯净
下面，我们介绍词根与-fy结合成的3个动词。
fortify [ fort = strong 强的；-ify=>“to make strong 使变强→]v. strengthen against attack 增强（阵地）；设防 / The soldiers fortified their position by building earthworks. 战士们构筑土木工事加强自己的阵地。
fortification n. 设防；设防阵地；筑城；筑垄；筑城学
identify [ ident = same 同一的；-ify→] v. ① cause to be the same; treat as the same 使等同于；同等对待 / A good king should identify the well-being of the people with his own. 好国君应将百姓的幸福视同己身的幸福。②prove to be the same鉴定，认出 / He indentified the wallet as his by telling what it contained. 他说出钱包里装的东西，证明它是自己的。
identification n. 认出；鉴定；验明；身份证明
petrify [ petr = stone 石；-ify=>“to cause to be a stone 使变成石”→] v. ① turn into a stone 使石化 / There is a petrified forest in Arizona in America. 在美国的亚利桑那州有一片石化林。② paralyze with fear or surprise 使（因惊慌等）发呆/ The girl was petrified as the snake came near. 当蛇爬近身边时，那女孩吓呆了。
petrification, petrifaction n. 石化作用；发呆
stupefy [ stup = amazed 受惊的；-efy =>“to cause to be amazed 使受惊”→]v. ① overwhelm with amazement or shock 使惊得发呆/ They were stupefied by the calamity.他们被灾难惊镇住了。② make stupid or senseless使麻木；使失去感觉/ He was stupefied by the drug. 他被那药物麻醉了。
stupefaction n. 麻木状态；昏迷
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