Your plan fell down when it proved too costly.
你的计划是不切合实际的，因为它被证实耗资太大。
Whether the plan is true remains to be proved.
这个计划是否正确还有有待于进一步证实。
The plan dropped through when it proved too costly.
当这个计划证明耗资过大时就停下来了。
His plan seemed to be too difficult, but before long it proved to be practicable.
他的方案看起来太艰难，可是没多久就被证实很适用。
The plan you came up with has proved practical and high efficient.
事实证明你提出的计划实用高效。
Subsequent happenings proved that his plan was better than mine.
后来发生的一切证明他的计划比我好。
The plan fell through when it proved too costly.
该计划耗资过于巨大，结果落空了。
The plan fell down because it proved to be too expensive.
计划没有施行，因为后来被证明太昂贵了。
The plan fell down because it proved to be too expensive.
计划没有施行，因为后来被证明太昂贵了。
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