Providing an on-board power supply is difficult, however, so he is investigating the use of external magnetic fields to power the device.
然而，倘若板载动力装置很难实现的话，他正在研究利用外部磁场给器件提供动力的途径。
This is a specially designed magnet that allows an operator to steer the capsule around using external magnetic fields generated in a belt worn by the patient when he is being examined.
它是由一个特制的磁体制成，患者接受检查时会佩戴一条带子以产生一个外部磁场，这样医生就可以通过这个外部磁场来控制胶囊的方位。
Most materials, including milk and water, are diamagnetic, which means they are repelled by external magnetic fields-though this phenomenon is far too subtle to be observed in normal circumstances.
大多数物质，如牛奶和水都是反磁体，即他们会排斥外来磁场，这种现象很微弱，在常规条件下是几乎是观察不到的。
When external magnetic fields are absent, there may be a competitive growth between (100) and (111) surfaces; and the final morphology of particles are irregular polyhedra.
而当外磁场不存在的时候，(111)面和(100)面可能存在竞争生长的关系，从而纳米粒子呈现不规则的多面体形。
To achieve this objective, in-depth study is needed on the growth mechanism of carbon nano-materials by arc discharge in liquid and the effect of various arc parameters and external magnetic fields.
为了实现这个目标，就需要深入研究液体电弧放电过程中碳纳米材料的生长机理，各种电弧放电参数和外加磁场对其影响。
To achieve this objective, in-depth study is needed on the growth mechanism of carbon nano-materials by arc discharge in liquid and the effect of various arc parameters and external magnetic fields.
为了实现这个目标，就需要深入研究液体电弧放电过程中碳纳米材料的生长机理，各种电弧放电参数和外加磁场对其影响。
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