我们已经用尽了所有其他治疗途径。

We have exhausted all other ___avenues of treatment.

这种创新方法为研究开辟了一条新途径。

This innovative approach opens up a new ___avenue for research.

我们需要在做出决定前考虑每一种可能的途径。

We need to consider every possible ___avenue before making a decision.