那个有塑料套的座位的角边周围有几处小裂缝。
The plastic-covered seat has a few small splits around the corners.
有时月球表面会出现小裂缝，而且会有气体从中溢出。
Sometimes tiny fractures appear at the surface, and gas escapes.
而在周期表里此行最重的元素，惰性气体氦，用于压力舱那类东西的小裂缝。
The next heaviest element in the periodic table, the inert gas helium, is used for detecting cracks in pressure vessels and the like.
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