Space travel can be so delightful but at the same time invisibly dangerous.
太空旅行是如此令人愉快，但同时又存在无形的危险。
太空垃圾极其危险。
The gas can be compressed to take up less space, but that can be dangerous.
压缩氢气占用的空间会小一些，不过很危险。
The gas can be compressed to take up less space, but that can be dangerous.
压缩氢气占用的空间会小一些，不过很危险。
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