As a result of this contraction, the thin lunar crust bursts and large cracks appear.
由于这种收缩，薄薄的月球地壳崩裂，出现了巨大的裂缝。
Lunar crust
原声例句
宇宙奥秘
宇宙奥秘
At this time, the increased gravitational stress worsened the effects of the lunar crust, instigating breaks and moon quakes.
此时，不断增加的重力应力恶化了月球地壳的影响，引发了断裂和月球地震。
经济学人-科技
That should yield a detailed map of the lunar crust, and how its thickness varies from place to place.
这次探测任务应该会产生出一份详细的月球外壳图，以及各个地方的厚度如何变化。
纽约时报 (New York Times)
He delivers a brief TED-style talk, while behind him we see a topographic model of what looks like blackened lunar crust.
他做了一个TED风格的简短演讲，而在他身后，我们看到了一个看似发黑的月壳地形模型。
英语百科
Internal structure of the Moon
Having a mean density of 3,346.4 kg/m³, the Moon is a differentiated body, being composed of a geochemically distinct crust, mantle, and core. This structure is believed to have resulted from the fractional crystallization of a magma ocean shortly after its formation about 4.5 billion years ago. The energy required to melt the outer portion of the Moon is commonly attributed to a giant impact event that is postulated to have formed the Earth-Moon system, and the subsequent reaccretion of material in Earth orbit. Crystallization of this magma ocean would have given rise to a mafic mantle and a plagioclase-rich crust.