来自 renew,更新。

1. A formal contract is signed which is renewable annually.

正式签订了每年可续签的合同。

2. Renewable sources of energy must be used where practical.

必须在可行的地方使用可再生能源。

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

风能作为动力的成功是对可再生能源一次立见分晓的检验。

4. Renewable energy will become progressively more important as time goes on.

随着时间的推移，可再生能源将变得愈发重要。

5. renewable sources of energy such as wind and solar power

像风力和太阳能这种用之不竭的能源