同时，日立金属（Hitachi Metals）也在致力于一种尽量少用稀土而使用铜合金的磁体的研究。
Hitachi Metals, meanwhile, is working on a magnet that minimizes the use of rare earths by employing copper alloys.
与此同时，日本的日立已经开始回收稀土金属用于硬盘和其他材料的制作。
In Japan, meanwhile, Hitachi has started a recycling effort to recover rare earths from hard drives and other materials.
与此同时，日本的日立已经开始回收稀土金属用于硬盘和其他材料的制作。
In Japan, meanwhile, Hitachi has started a recycling effort to recover rare earths from hard drives and other materials.
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