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1·This process is a source of acetyl-CoA molecules for the citric acid cycle.

这个过程是三羧酸循环的乙酰辅酶A分子的来源。

2·Your proposed sequence must not involve the net consumption of other citric acid cycle intermediates.

你提出的顺序不能包括其他三羧酸循环中间产物的消耗。

3·Although oxygen does not participate directly in the citric acid cycle, the cycle operates only when O2 is. present.

尽管氧气没有直接参与三羧酸循环，循环却只有在氧气存在时才能进行。