There's no need to be so unfriendly towards them.
沒必要對他們這么不客氣。
She has a very formal manner, which can seem unfriendly.
她的舉止很是鄭重其事，有可能會顯得不友好。
His tone was curt and unfriendly.
他說話的語調粗暴無禮。
Use more eco-friendly materials, and less of it.
使用更加環保的材料，并盡量少用。
Study on Preparation and Properties of Eco-friendly Functional Cotton Fiber with Selective Oxidation
選擇性氧化法制備環境友好型功能棉纖維研究
Environmental protection and development of the eco-friendly fabric softening agent
環境保護和環保型織物柔軟劑的發展探討