Obviously, Apple wants to make a profit, so the bill of materials has to cost less than the device.

显然， Apple 想要盈利，所以物料清单的成本必须低于设备成本。

Not only was it more expensive, but the difference between the bill of materials and the retail cost was much greater.

它不仅更贵，而且物料清单和零售成本之间的差异也大得多。