Half the population could suffer from hay fever within 20 years,experts warn..
專家們警告說,世界上一半的人口將在20年內患上花粉癥。
Some 15 million Britons are currently afflicted, but with more people moving to cities, the number of sufferers will double to 32million by 2030.
英國有約1500萬人目前已染上這種病癥,而且隨著越來越多的人口向城市遷移,這一數(shù)字將在2030年前成倍增長,達到3200萬。