同时，射频能量加热能关闭细小血管，减少了组织出血的危险。
At the same time, heat from radiofrequency energy closes small blood vessels and lessens the risk of bleeding.
这种改进的技术包括下列三个步骤：利用增强的X射线显示出藏匿的物品、利用传感技术搜寻危险化学品，并利用无线射频技术识别液态和固态物质。
There are three main approaches: enhanced x-rays to spot hidden objects, sensor technology to sniff dangerous chemicals, and radio frequencies that can identify liquids and solids.
有些人认为接触射频的危险性可能存在，甚至可能很严重。
Some people perceive risks from RF exposure as likely and even possibly severe.
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