单词：space debris
space debris的用法和样例：
例句
- The issue of space debris is a big challenge to further expansion of space activities.空间碎片问题是人类进一步开展航天活动所面临的一个重大挑战。
- They are concerned because space debris can puncture the space station walls and jam mechanisms.他们关心空间碎片可以穿透空间站墙壁堵塞机构。
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