都市的光污染意味着，世界上五分之一的人们仅凭借裸眼将看不到银河。
Urban light pollution means that one-fifth of the world's population can no longer see the Milky Way with the naked eye.
小麦是世界上种植最广泛的作物，为全世界五分之一的人口提供口粮。
Wheat is the most widely planted crop in the world, providing a fifth of mankind's calories.
五分之一的人(占总数19%)不知道法语中表示“你好”的单词的意思，但这个单词是世界上最有名的外国问候语之一。
One fifth (19 per cent) did not know the meaning of the French word for hello, one of the most recognisable foreign greetings in the world.
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