你是不是认为精油对皮肤完全无害?
<p><span word="Essential">Essential</span> <span word="oils">oils</span> <span word="may">may</span> <span word="be">be</span> <span word="natural">natural</span>, <span word="but">but</span> <span word="that">that</span> <span word="doesn">doesn</span>'<span word="t">t</span> <span word="mean">mean</span> <span word="they">they</span>'<span word="re">re</span> <span word="always">always</span> <span word="healthy">healthy</span> <span word="or">or</span> <span word="good">good</span> <span word="for">for</span> <span word="you">you</span>. <span word="They">They</span>'<span word="re">re</span> <span word="extremely">extremely</span> <span word="concentrated">concentrated</span> <span word="versions">versions</span> <span word="of">of</span> <span word="chemicals">chemicals</span> <span word="that">that</span> <span word="plants">plants</span> <span word="make">make</span> <span word="for">for</span> <span word="various">various</span> <span word="reasons">reasons</span>: <span word="some">some</span> <span word="to">to</span> <span word="attract">attract</span> <span word="pollinators">pollinators</span>, <span word="some">some</span> <span word="to">to</span> <span word="repel">repel</span> <span word="or">or</span> <span word="harm">harm</span> <span word="their">their</span> <span word="natural">natural</span> <span word="enemies">enemies</span>.</p><p>精油可能是天然产品，但这并不意味着精油一定是健康的、有益的。植物因各种原因（吸引传粉昆虫、击败或伤害它们的天敌）产生化学物，而精油就是这些化学物的浓缩产物。</p><p><span word="These">These</span> <span word="oils">oils</span>' <span word="utility">utility</span> <span word="to">to</span> <span word="humans">humans</span> <span word="is">is</span> <span word="mainly">mainly</span> <span word="that">that</span> <span word="they">they</span> <span word="smell">smell</span> <span word="good">good</span>, <span word="which">which</span> <span word="you">you</span>'<span word="ve">ve</span> <span word="probably">probably</span> <span word="already">already</span> <span word="figured">figured</span> <span word="out">out</span>: <span word="essential">essential</span> <span word="oils">oils</span> <span word="don">don</span>'<span word="t">t</span> <span word="cure">cure</span> <span word="cancer">cancer</span> <span word="and">and</span> <span word="there">there</span>'<span word="s">s</span> <span word="no">no</span> <span word="solid">solid</span> <span word="evidence">evidence</span> <span word="they">they</span> <span word="do">do</span> <span word="much">much</span> <span word="of">of</span> <span word="anything">anything</span> <span word="else">else</span> <span word="for">for</span> <span word="health">health</span>.</p><p>人们使用精油主要是因为味道好闻，我猜你可能已经想到了：精油不能治愈癌症，而且尚未有证据明确表明它对健康有益。</p>
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