Three main approaches controlling structure and morphology of ultrafines by modeling biological mineralization are introduced, and its development is looked for ahead.
阐述了生物矿化作用机理及其主要的生物控制因素，介绍了模拟生物矿化控制超细粉末结构形貌的三个途径，并展望了其发展趋势。
People use a variety of both conscious and unconscious processes to deal with their angry feelings. The three main approaches are expressing, suppressing, and calming.
人们使用各种各样有意或无意的意识来应对愤怒的情绪，三个主要的办法就是发泄、抑制和平息。
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.
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。
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