The basic rules and words of Esperanto were proposed by L. L. Zamenhof at the end of the 19th century, the idea was to create a world language that everyone could speak.
世界语的基本规则和单词发明于19世纪末，为L.L. Zamenhof所创立，其目的是创造一种人人能说的世界通用语言。
L understand chemicals procurement, transportation, storage and use of security rules, in the process of familiar dangerous chemicals MSDS concerned and safety issues.
l了解化学品采购、运输、储存、使用过程中的安全规定，熟悉常见危险化学品的MSDS及安全要点。
L understand chemicals procurement, transportation, storage and use of security rules, in the process of familiar dangerous chemicals MSDS concerned and safety issues.
l了解化学品采购、运输、储存、使用过程中的安全规定，熟悉常见危险化学品的MSDS及安全要点。
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