Dōngtiān tā kào dòngzi lǐ zhòng de qīngcài zhèng qián.
In winter he makes money from the greens he grows in the greenhouse.
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The 'greenhouse' meaning is a northern colloquial use noted in 新华词典 (Xinhua Cidian). For a typical glass/plastic greenhouse, prefer 大棚 (dàpéng) or 温室 (wēnshì); 洞子 specifically suggests a sunken/sheltered winter plot.
