This plan need not be expensive, but it faces one big difficulty.
这项计划花费不大，但却面临一个很大的难题。
For these rural children, strength isn't a problem, but etiquette is a big difficulty.
对于这些来自农村的孩子，体力不是问题，礼仪方面的学习却是个难题。
The chance is very big , difficulty is not small.
机会很大，困难不小。
The chance is very big , difficulty is not small.
机会很大，困难不小。
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