These folds are lined with tiny hair-like villi and even tinier microvilli, which create a truly impressive surface area — large enough that, if it were unfolded, it would cover a tennis court.
这些褶皱内衬着微小毛发状绒毛,甚至更小微绒毛,这创造了一个真正令人印象深刻表面积——足够大,如果展开,它将覆盖一个网球场。