英语语法分析

Some metals are found in their native status, that is, uncombined with other elements.

有些金属是以天然状态存在的，即不与其他元素化合。

Feed it as well with unburned and uncombined foods because that which is simple and natural is best.

同样，去摄取没有烧过和非合成的食物，因为简单和自然是最好的。

Iridium probably does not occur uncombined in nature but it is found in natural alloys with other noble metals.

自然界中可能不存在纯铱，通常和其它贵金属共生于天然合金中。