天際綫
天際線，即視界極處，天地之交匯也。仰望遠方，地平如線，青天蒼穹與之相接，形成一界限。古人稱之為天涯或地極，寓意天地相連而無窮盡也。旅人行至遠處，覺地天相隔，遂以地平線為目之所及，天之所覆，而無法直達之境地。
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