Each day, thousands of stories are submitted to Digg by its users, who often have vastly different reasons for submitting them.
每天都有许多用户在博采网站上发表成千上万的文章。人们经常是以各不相同原因发表他们的文章。
In small groups, highlight sentences using different tenses. Each student explains the reasons for the tense in each sentence.
在小组里，着重强调使用不同时态的句子。每位同学解释一下不同句子使用不同时态的原因。
Today the problem of cloning has been brought into focus. different people hold different opinions. however each phenomenon exists for a number of reasons.
今天，克隆已经成为关注的焦点问题。不同的人持有不同的观点。然而每个现象都有它存在的原因。
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