1. It is absolutely essential to reverse the irrational misuse of nonrenewable resources . For example , fuel-efficient motor vehicles must be developed to reduce oil consumption and alternative energy sources must be found to replace coal .

　　徹底改變對(duì)不可再生資源的非理性濫用是絕對(duì)有必要的。例如，必須開發(fā)節(jié)能的機(jī)動(dòng)車減少汽油的消耗量，并且必須找到可替代能源取代煤。

　　2. While achieving success is easier said than done , persistence does in fact pay off . One of the most important traits of a successful person is self-confidence , another is desire , and still another is determination .

　　獲得成功說起來比做起來容易，然而堅(jiān)持不懈確實(shí)會(huì)有好結(jié)果。成功人士的最重要的特征之一是自信，第二是渴望，還有一個(gè)是決心。

　　3. Recognizing a problem is the first step in finding a solution .

　　認(rèn)識(shí)到問題是找到解決辦法的第一步。

　　4. Many of the explanations offered thus far are at least to a certain extent valid , but none fully address the problem and the issue must be examined in a wider context .

　　目前提供的許多解釋至少在一定程度上是正確的，但是，沒有一個(gè)解釋能完全處理問題，這件事情必須放在更廣闊的背景中考慮。