求翻译：1.这个会议是为纪念爆炸中的死难者所举行的2.了解一个国家的一种办法是收集这个国家的邮票3.班同学分成几组来讨论4.我想知道有多少个国家参加了上届奥运会5.如果人人都做一点贡献来保护环境的话，世界将会变得更美是什么意思？

1 This meeting is to commemorate the victims of the explosion at 2. One way to understand a country is to collect stamps in this country 3 class will be divided into 4 groups to discuss and I would like to know how many countries participated in the 5 last Olympics if everyone make some contribution

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1. this conferences are explode 2. for the commemoration which the victim holds to understand a national one means are postage stamp 3. schoolmate Ban who collects this country divide into several groups to discuss 4. me to want to know had how many countries to attend the previous session Olympic G

1. the meeting was held to commemorate the victims of the explosion in the 2. a way of understanding a country is to collect the stamps in this country of 3. students into several groups to discuss 4. I would like to know how many countries participated in the last Olympic Games 5. If everyone do a

1. the meeting was held to commemorate the victims of the explosion in the 2. a way of understanding a country is to collect the stamps in this country of 3. students into several groups to discuss 4. I would like to know how many countries participated in the last Olympic Games 5. If everyone do a