一个: one; a; an的: 4次方是 The fourth power of 2 i ...问题: question; problem一个难的问题: a difficult question一个非常好的问题: a very good question一个很严重的问题: a very serious problem一个很重要的问题: to answer questions that are key一个辣手的问题: a thorny problema hard nut to crack一个微妙的问题: a tricky problem一个严重的问题: a serious problem服务的一个客户的问题: u860 sp1那是一个很难回答的问题: thats a tough question to answer问观众一个挑战性的问题: to ask the audience a challenging question我问一个简单的问题: as i ask a simple question一个有待解决的问题是: it is an open question whether any behavior based on fear of eternal punishment can be regarded as ethical or should be regarded as merely cowardly一个有很大风险的问题: close 2这是一个很重要的问题: this is an important issue to be discussed只是一个时间长短的问题: a matter of time只问一个难回答的问题: only one difficult question这个问题关系到一个更重要的问题: this question has a bearing on a much more important one对于一个位于实际的问题域: problem domain他现在正面临一个十分重要的问题: he is faced with an important problem无可否认，空气污染是一个极其严重的问题: there is no denying the fact that air pollution is an extremely serious problem： the city authorities should take strong measures to deal with it要我回答一个很重要的问题: to answer questions that are key这是一个需要慎重考虑的问题。: it is aquestion that needs very careful consideraton
