Donna DiFelice believes honoring U.S. soldiers can be environmentally sound.

唐娜·德·菲利斯认为，纪念美国士兵可以做到环境友好。

How do we extract the minerals in an environmentally sound manner.

我们如何以对环境无害的方式提取矿物。

How do we extract the minerals in an environmentally sound manner?

我们如何以对环境无害的方式提取矿物。

If we are ever going to protect the atmosphere, it is crucial that those new plants be environmentally sound.

如果我们要保护大气，这些新工厂对环境无害是至关重要的。

Certainly some of the more environmentally sound materials are more expensive but increasingly, as their popularity grows, the actual cost of the fibre and the manufacture will actually come in line with other traditional fibres.

当然，一些更环保的材料更昂贵，但随着它们越来越受欢迎，纤维和制造的实际成本将越来越接近其他传统纤维。