过去关于驱虫剂的作用原理的理论是DEET阻断了昆虫侦测到人体散发的乳酸气味的能力，而乳酸对蚊子来说就像磁铁一样有吸引力。

The old theory of how insect repellents work was that DEET blocks the insect's ability to detect lactic acid from people, which acts as a mosquito magnet.

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研究设计了CYCIAE-30回旋加速器主磁铁液压举升系统的油路结构和控制系统，并说明了它的工作原理。

The oil-line structure, control system and their working principles of the hydraulic lifting system for the main magnets of CYCIAE-30 cyclotron are introduced.

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根据电磁学原理，利用电磁铁作为主动悬架的作动器，构造出电磁作动器的一般结构。

Based on electromagnetic theory, electromagnet is used for actuator of active suspension and a general electromagnetic actuator is constructed.

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