在创建系统时，必须为其部件选择合适的材料。
When a system is to be built, suitable materials must be chosen for the parts.
要根据磁场频率和强度选择合适的屏蔽材料。
Shield the magnetic field with an appropriate material for the frequency and field strength.
要根据磁场频率和强度选择合适的屏蔽材料。
Shield the magnetic field with an appropriate material for the frequency and field strength.
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