铁和叶酸补充剂常给孕妇服用。
Iron and folic acid supplements are frequently given to pregnant women.
特定的反应中，我有氢气，固态铁，这些都已经是，处于室温和常压下，最稳定的元素单质。
Now in this particular reaction, I've got hydrogen gas, iron solid. Those already are elements in their most stable forms at room temperature and pressure.
铁单质是固态，这是他在室温和常压下，最稳定的状态，然后我们，可以算出生成热，现在这个。
Iron as an element is a solid. That's it's most stable state at room temperature and pressure, right, and so on. And then we can figure out heats of formation.
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