The do-it-yourself option recently got a boost, when researchers demonstrated the feasibility of 3-d custom parts printing using raw materials available on the moon.

当研究人员表明了3 - D定制配件打印机的可行性(能采用月球上的原材料制作成品)，自己动手制作一时风行起来。

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Finally, in accordance with China's present situation, this article expounds the feasibility of the indexed option and comes up with some corresponding Suggestions in order to consummate it.

最后结合我国的实际情况，说明指数化期权的适用性以及提出相应的完善建议。

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But Gen Allen said that the idea of no American military presence in the country was not an option, and that he had not even been asked to look at its feasibility.

BBC: Afghan Isaf commander John Allen sees 'road to winning'