The feeble old man said it would be a luxury to be able to walk to the riverside and watch his grandchild swimming., 这位虚弱的老人说，他到海边去看孙子游泳也几乎不能了。

At the present time, from the point of view of recycling waste heat of intermediate and low temperature fume the recuperator ...

Amory Lovins is cofounder of the Rocky Mountain Institute and the instigator of ingenious ideas to transform the energy and ...