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的发状绒,甚至更小的微绒,这创造了一个真正令人印象深刻的表面积——足够大,如果展开,它将覆盖一个网球场。