The second advantage of online shopping is that it is available 24/7.这里的24/7是什么意思

The second advantage of online shopping is that it is available 24/7.这里的24/7是什么意思 the second The second the second the second the second the second The Second the advantage the Disneyland in china The disadvantage and advantage of computer英语论文 the advantage and disadvantage of computer the advantage and disadvantage of learning online The advantage and disadvantage of studying abroad? the advantage of smiling 英语作文 the number one advantage什么意思 The advantage or disadvantage of mobile phones? the second和a second的区别 急,second 和 the second什么区别