1.目前:可用currently或at present表达。
2.年龄在18岁至30岁之间的人口数量约为2.7亿:可译为there are about 270 million people aged between 18 and 30。
3.城镇居民全年人均可支配收入:其中“人均”可译为per capita,“可支配收入”可用disposable income表达。
4.买得起：用afford—词表达。
5.智能手机普及率仍被中国超过:“普及率”可用coverage表达，“超过”可用surpass或overtake表达，故该处译为the coverage of smartphone is still surpassed by China。