building materials 建筑材料.（其余三项都没有建筑材料的意思.）
翻译：棕榈树是热带地区人们食物和建筑材料的重要来源.
The palm tree is an essential source of food and——for people living in the tropics.
The palm tree is an essential source of food and——for people living in the tropics.
built materials
to build materials
material buildings
building materials
给出正确答案,给出理由和翻译
built materials
to build materials
material buildings
building materials
给出正确答案,给出理由和翻译
英语人气：617 ℃时间：2020-04-05 12:56:34
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