free space
柯林斯词典
1. N a region that has no gravitational and electromagnetic fields: used as an absolute standard 自由空間; 沒有重力場和電磁場的區域，被用作絕對標準 (Also called (no longer in technical usage) vacuum)
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1. N a region that has no gravitational and electromagnetic fields: used as an absolute standard 自由空間; 沒有重力場和電磁場的區域，被用作絕對標準 (Also called (no longer in technical usage) vacuum)