A formal contract is signed which is renewable annually.

签署的一份正式合同每年可续签一次。

《柯林斯英汉双解大词典》

The success of wind power represents a litmus test for renewable energy.

风能利用的成功是对可再生能源的一次立见分晓的检验。

《柯林斯英汉双解大词典》

Generating enough light could be prohibitively expensive, unless cheap, renewable energy is available, and this appears to be rather a future aspiration than a likelihood for the near future.

除非有廉价可再生能源，否则制造足够光的成本可能会高得令人望而却步，而这似乎只是未来的愿望而非近期能实现的。

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"One of the benefits is it's a relatively inexpensive renewable material that's readily available."

VOA: special.2009.10.05

So we needed to come up with another source, a renewable source, so we turned our attention to embryonic stem cells.

因此，我们需要一种替代材料，一种可以再生的材料，我们注意到了胚胎干细胞胚胎干细胞。

斯坦福公开课 - 7个颠覆你思想的演讲课程节选

As a professor of renewable energy, he already knew about the technology.

VOA: special.2009.12.21

Instead of a renewable resource I would have bet on a non-renewable one (oil).

ECONOMIST: Menem replies

Earlier this week, the Edison Electric Institute, the industry group for investor-owned utilities, circulated a letter in the House urging lawmakers not to vote for the RPS. Corporations such as Atlanta-based Southern Company and Charlotte-based Duke Energy hold firm that a renewable mandate is a state issue, not a federal one.

FORBES: Magazine Article

Earlier this week, the Edison Electric Institute, the industry group for investor-owned utilities, circulated a letter in the House urging lawmakers not to vote for the RPS. Corporations such as Atlanta-based Southern Company and Charlotte-based Duke Energy (nyse: DUK - news - people ) hold firm that a renewable mandate is a state issue, not a federal one.

FORBES: Why The Energy Bill Will Die