甲烷和乙烷都是含有eth基团的简单碳氢化合物。

Methane and ___ethane are both simple hydrocarbons containing an ___eth group.

她正在学习如何在以太坊上开发智能合约。

She is learning how to develop smart contracts on ___ETH.

这家品牌因其环保政策而获得了良好的道德声誉。

This brand has gained a strong ___ethical reputation due to its eco-friendly policies.