There's no need to be so unfriendly towards them.
没必要对他们这么不客气。
She has a very formal manner, which can seem unfriendly.
她的举止很是郑重其事，有可能会显得不友好。
His tone was curt and unfriendly.
他说话的语调粗暴无礼。
Use more eco-friendly materials, and less of it.
使用更加环保的材料，并尽量少用。
Study on Preparation and Properties of Eco-friendly Functional Cotton Fiber with Selective Oxidation
选择性氧化法制备环境友好型功能棉纤维研究
Environmental protection and development of the eco-friendly fabric softening agent
环境保护和环保型织物柔软剂的发展探讨