Between the trees a long board is hanging--it is a swing.
树间挂着一块长木板——那是一个秋千。
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(the idea can arguably be traced back as far as the Hanging Gardens of Babylon, built around 600bc.) So far, however, the idea remains firmly on the drawing board.
Post a visible reminder that this job is only temporary. When I once worked in a job I hated, I helped bide my time by hanging a reminder on my bulletin board that said, "this is only temporary."