In Chapter 32 discussed the magnetic fields set up by moving charges or by currents in conductors, when the charges or conductors are in air (or, strictly speaking, in vacuum). However, pieces of technical equipment,such as transformers, motors,generators,or electromagnets, always incorporate iron or an iron alloy in their structures, both to increase the magnetic flux and to confine it to a desired region. The magnetic field of a galvanometer or loudspeaker is set up by a permanent magnet, which produces this field without any apparent circulation of charge. The coating on magnetic tape makes a record of information supplied to it by the extent to which it becomes permanently magnetized.
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While introducing the techniques from abroad, domestic attention should be paid to the breakthrough of the corresponding technologies such as transformers.
在引进技术的同时要注意国内变压器等相关技术的突破；
'I used to go to warehouses that stock materials to check the inventory such as transformers and wires, ' he told the Denki Shimbun, an electric-industry trade newsletter.
他对电气工业报纸《电气新闻》（Denki Shimbun）的记者说，我以前常去存放材料的仓库清点变压器和电线等物品的库存。
It includes seven theme parks, such as Kung Fu Panda: Land of Awesomeness and Transformers: Metrobase.
它包含如功夫熊猫盖世之地和变形金刚基地等7大主题景区。
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