So iron left to own devices in the atmosphere in the presence of a little bit of water, with the water form iron oxide.

铁在大气中，在存在,少量水的条件下，大气会开始与水结合产生氧化铁。

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but at the same time, it's kind of more, you are left to your own devices.

但是与此同时，也更，你要靠自己。

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It's his absence that leaves the boy alone to his own devices.

正是他的缺席让这个孩子一个人,玩自己的玩具。

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