Stress fractures, or tiny cracks in the surface of a bone, are serious running injuries that requires immediate treatment.
应力性骨折，或者在骨头表面上的微小裂缝，是严重的跑步受伤，并且需要立即治疗。
They can cause microscopic cracks in the surface of the enamel, which could lead to bigger dental problems over time.
它们能引起牙釉质表层的细微裂缝，进而随着时间的推移导致更大的牙齿问题。
Hydrothermal vents are cracks in the Earth's surface that occur, the ones we are talking about here are found deep at the bottom of the ocean.
深海热泉是地球表面出现的裂缝，我们在这里提到的裂缝是在海底深处发现的。
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