Biomass energy derived from plant and animal matter is still another renewable source being considered as a standby replacement for fossil fuels.

动植物物质所产生的生物能源也是一种可再生能源，且被认为是矿物燃料的备用替代品。

After uniting in the Yosemite Valley, and expending the down-thrusting energy derived from their combined weight and the declivity of their channels, the grand trunk flowed on through and out of the Valley.

在约塞米蒂山谷汇合后，耗尽了从它们的总重量和通道的斜坡中产生的向下推动的能量，巨大的树干流经并流出山谷。