我们求助的请求被置之不理。

Our pleas for help ___fell ___on ___deaf ___ears.

他关于合作的呼吁无人理会。

His appeals for cooperation ___fell ___on ___deaf ___ears.

在那些被短期利益驱使的地区，环保主义者关于森林砍伐的警告常常被置若罔闻。

Environmentalists' warnings about deforestation often ___fall ___on ___deaf ___ears in regions driven by short-term profits.