They operate as "black boxes"; external components neither know nor care how they perform their function, merely that they return the expected result.

它们就像“黑匣子”一样运行：外部组件既不知道也不关心它们如何执行它们的功能，而仅仅关心它们是否返回期望的结果。

youdao

We cannot live with their current practices, but nor can we live without them; their function - assessing the risk of securities - is indispensable.

我们无法容忍他们现在的做法，但我们也不能缺少他们，因为评级机构评估证券风险的职能不可或缺。

youdao

We hope that the therapy is effective. We also hold the opinion that we neither put sole emphasis on particularly effective medicine nor on one special medicine’s sufficient function.

我们希望这个综合治疗是有效果的，同时也反映了我们不单独强调某一味药特别有效或者单独就能起到足够作用的看法。

youdao

The department's multi-discipline team "had neither the appropriate ethos nor processes in place to allow it to function effectively", the report said.

BBC: Hospital sign