1.But this was rejected out of hand, largely because the savannah theory was considered unchallengeable.
但这一想法立刻遭到否定，很大程度上是因为大草原理论在当时不容挑战。
2.Exchange rate theory holds an unchallengeable basic position in the international macroeconomics.
在国际宏观经济学领域，汇率理论的基础地位是无可争辩的。
3.In derivatives overall, is the CME's dominance now unchallengeable?
就整个衍生品市场而言，芝加哥商品交易所（CME）目前的主导地位是否是不可动摇的？
4.The sovereign right of the Irish people to decide their own future is unchallengeable.
爱尔兰人民有自主决定其未来的权力，这是不可置疑的。
5.If life is experienced without any painful or disastrous experiences, it is a life that is very unchallengeable!
人生如果只是没有任何痛楚灾祸经验，那样的生命是没有挑战的！