There may not be aliens on the far side of the moon, but there are still many questions about it that we are still in the dark about, like why does the crust appear thicker on the far side?

远地侧可能没有外星人，但是那里仍然会有许多问题，我们现在仍旧不清楚。例如：为什么远地侧的地壳会更厚呢？

youdao

I never knew bread could be this good; the crust was this dark brown, sweet crust that turned chewy in your mouth.

VOA: standard.2010.07.16

The longer the aging, the better the flavor and tenderness, but also the more the shrinkage as water evaporates and a dark crust develops, which must be cut away.

CNN: How to buy the best beef