have a crust的意思|示意

These, together with reasonable guesses about the Earth's overall composition, have been used to put together the familiar model of an iron core, a rocky mantle and a thin crust.

这些连同有关地球总体构成的合理猜想，一起形成了我们熟悉的地球模型——铁质地核，岩石地幔和较薄的地壳。

These cheeses have a characteristic "bloomy" crust, created when bacteria ripen the cheese from the inside out.

这类乳酪的标志就在于有一层“粉粉的”表层，这是由细菌在乳酪从内向外成熟的过程中造成的。

The rocks and crust from the smaller moon would have spread over and around the bigger moon without creating a crater, as a faster crash would have done.

但低速撞击的结果和高速撞击的效果一样，小月亮上原有的尘与土蔓延开来萦绕在大月亮表面，撞击并不产生坑洞。