“river trekking”的概念、定义、翻译、参考文献-科学参考

单词	river trekking
释义	river trekking Encyclopedia 教育学体育休闲与娱乐释 river trekking；river tracing溯溪运动由溪流的中下游溯行至上游源头的溪谷攀登项目，冒险性高且需具备多种技巧。
随便看	operator product operator product expansion operator range operator ray operator ring operator root operators'characteristic value-added telecommunication service operator scheme operator semi group operator semi-group operator semigroup operator semi-group of class C0 operator semi-group of class C_0 operator semigroup of class C0 operator set operator sine function operator space operator spectrum operator splitting operator splitting method operator-stable operator structure operator theorem operator-theoretic method operator theory

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