The distinctions between formal, informal, and non-formal were first developed in the 1950s by people working in the area of international development.
1950年代，国际开发领域的人们首次进行了正式、非正式、非正规学习的区分。
The results suggested that the infection rate of human parasites has remarkably dropped, but parasitic diseases still are one of main diseases in non developed area in Jiangsu Province.
结果表明，江苏省人体寄生虫的感染率较10年前已有大幅度下降，但寄生虫病仍是危害欠发达地区居民的主要疾病之一。
Based on nomorous geologic works, a new concept on non-carst rockmass exist in carst rockmass area without piping leakage has been developed.
根据大量地质工作，我们在隔河岩枢纽坝区建立了岩溶化河间地块存在非岩溶岩块的论点，并作出无岩溶管道渗漏的结论。
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