这台电脑的操作系统需要更新了。

This computer's ___OS needs to be updated.

这种稀有金属合金中添加了少量的锇以增强其硬度。

A small amount of ___Os was added to this rare metal alloy to improve its hardness.

医生检查了他口腔里的骨头是否有损伤。

The doctor checked if there was any damage to the ___bones in his mouth.