该博览会将成为首次在发展中国家举行的注册类世博会的翻译：The Expo will be held in developing countries registered for the first time international exhibitions 什么意思？中文翻译英文，英文翻译中文，怎么说？

青云英语翻译

The expo will be the first class in developing countries, the World Expo at the registration

The Expo will be held in developing countries registered for the first time international exhibitions

This exposition will become for the first time in the developing nation hold registration class World Expo

正在翻译，请等待...

The Expo will be held in developing countries registered for the first time international exhibitions