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