不参与

Without calory, it does not involve in metabolism in human body.

无热量，不参与人体代谢。

Along with these there may be co-regents, who exercise no sovran power, but are marked out as eventual successors.

和他们地位相同的则有联合摄政，他们不参与权力运作，只是作为终继承者的标志。