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| English | Chinese |
| space travel Travel in the space beyond the earth's atmosphere performed for scientific research purposes | 太空旅行 (为了科学研究，在地球大气层以外的空间旅游。) |
| travel cost Expenditure of money or the amount of money incurred for journeying or going from one place to another by some mode of transportation | 旅行费用 (旅行或通过某种交通方式从一个地方到另一个地方而产生的花费或支出的金额。) |