- 天空: the sky; the heavens
- 线: thread; string; wire
- 地平线;天空线: skyline
- 空线: disengaged line; dead line; [电学] idle wire; free line; idle line◇空线信号 [讯] free line signal
- 天空: the sky; the heavens 蔚蓝的天空 a blue sky; 瞧, 一架飞机在天空飞翔! look, a plane is flying in the sky
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