They are cash settled and cannot result in the delivery of the underlying metal.
所有的合约都以现金结算，因此不会有任何相关实物金属的交付。
It runs without the need for an underlying operating system - something called "running on the bare metal" (see Resources).
它无需底层操作系统便可运行—也就是所谓的“在裸机上运行”(见参考资料)。
During the laser sintering, due to the large liquid phase viscosity and surface tension, the balling effect occurred when the molten did not wet the solid metal particle and the underlying substrate.
实验发现，在液相粘度较高、表面张力大，熔体材料不浸润固相颗粒和基板等因素的影响下，烧结过程中出现了球化现象。球化的出现妨碍了直接金属激光烧结成形的顺利进行。
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