【问】 The sound of the party was almost deafening when Sidney entered into the room，but soon he was able to distinguish Nancy’s voice from the other’s. (TOEFL，72.10)
 我看不出这个句子有什么毛病。
 【答】 使用enter into the room这样的组合，是我们中国人常犯的一个错误，学过德、俄文等外语的人尤其如此。应当牢记，enter在作“进入”解时，是个及物动词，后面不能跟介词in或into等等，属正式语体：
 1. The boy Robert entered college that autumn. (Lewis)
 那年秋天这个叫罗伯特的男孩进了大学。
 2. I had entered the clinic on the previous Saturday afternoon. (Snow)
 上星期六下午我去了诊所。
 3. This would solve the problem of ventilation，for if a train entered this tunnel，it woulddraw in fresh air behind it. (NCE 2，L.64)
 这样就可以解决通风问题，因为如果火车开进隧道，它后面就会带进新鲜空气。enter into的意思是：开始(讨论、谈判等等)，签订(合同、婚约等等)，参与(政治等等)：
 1. They entered into negotiations with their business rivals.(EPV)
 他们开始与他们的商业竞争对手谈判。
 2. She entered into a five-year contract. (EPV)
 她签订了一个为期五年的合同。
 3. He entered into politics as a hobby. (MD)
 他参与政治，作为业余爱好。
 4. Britain has entered into a new trade agreement with Ireland.
 大不列颠和爱尔兰签订了新的贸易协定。
 5. Our chief competitor wishes to enter into dealings with the firm. (LDPV)
 我们的主要竞争对手希望和这家公司做生意。
 6. Once you have reached informal agreement，you should enter into a contract with theother party. (LDPV)
 你一旦达成非正式协议，就应该和对方签订合同。
 7. The two governments entered into preliminary discussions in the hope of reachingcomplete agreement at a full conference. (ODCIE)
 两国政府开始了预备性讨论，希望能在正式会谈时完全达成协议。
 8. Susan could see that the man in the opposite seat was dying to enter into conversationwith her，and as she found him quite attractive she helped him by asking ‘Do youhappen to know what time this train is due at Euston?’ (ODCIE)
 苏珊看出对面座位上那个男人非常想和自己攀谈，她在发现这个男人颇有吸引力之后，就主动搭讪，故意问他：“您知不知道这趟火车应该几点到达尤斯顿?”
 enter的另一个常见的词义是“成为……部分”，有时可理解为“被列入”、“被纳入”、“(被)包括”、“进入”：
 1. Oxygen enters into many compound bodies.
 氧是许多化合物的组成成分。
 2. All the matters enter into our plans. (LDPV)
 所有这些情况都包括在我们的计划之中了。
 3. The possibility of an air-attack from the west did not enter into the calculations of theGeneral Staff. So they were entirely unprepared when the apparently impossible actu-ally happened. (ODCIE)
 总参谋部没有考虑到敌方从西边来空袭的可能性，因此，当看来不可能发生的事实际上发生时，他们竟毫无准备。