total = total + n;
but something like:
，详情可参考新收录的资料
A microfluidics chip enables researchers to manipulate and study individual cells, without the use of agar at all. Credit: Brouzes E. et al. PNAS (2009).
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，推荐阅读新收录的资料获取更多信息
Певцов резко высказался об иностранных псевдонимах российских артистов14:12
Covering spaces are a fundamental concept in topology. Some typical examples can be seen in this previous post.。新收录的资料对此有专业解读