Some expositions on "essential safety" are introduced.

介绍了几种“本质安全”的论述；

Chinese exhibits won many prizes in previous world expositions.

并且中国的展品在历届世博会上获得过很多奖项，比如在首届世博会上，来自中国上海的商人徐荣村，就凭其自己的“荣记湖丝”获金、银大奖；

Chinese exhibits won many prizes in previous world expositions.

中国的展品在历届世博会上获得过很多奖项。

They seem a little interchangeable with conferences and expositions.

它似乎是会议与展览会的同义词。

World Expositions are galleries of human inspirations and thoughts.

世界博览会是们灵感和思想的闪现区。