新款平板电脑有很多令人兴奋的功能。 Smartphones with features such as retinal scan can recognise the owners by scanning their eyes. 带有视网膜扫描这类功能的智能手机可以通过扫描眼睛来识别设备的主人。 Feifei 下面来看单词“trait”和“characteristics”的区别。