conservation of natural resource
[能源英汉词典]
conservation of natural resourcen.自然资源保护
是什么意思,conservation of natural resource的解释,conservation of natural resource的翻译
[环境英汉词典] conservation of natural resource
conservation of natural resource
[能源英汉词典]
conservation of natural resource是什么意思,conservation of natural resource的解释,conservation of natural resource的翻译
[环境英汉词典] conservation of natural resource