这本书提出了一些严重的伦理问题。

The book raises some serious ___ethical questions.

尽管如此，我不支持安乐死，甚至认为仁慈杀害存在严重的伦理问题。

In spite of this, I am not in favour of euthanasia and I even think that mercy killing holds severe ___ethical problems.

公司必须在商业实践中遵守道德标准。

Companies must adhere to ___ethical standards in their business practices.