tiān qì / zhuǎn liáng / hòu / gōng zuò rén yuán / wèi / wēn shì / jiā wēn / fáng zhǐ / yòu miáo / shòu dòng

天气转凉后，工作人员为温室加温，防止幼苗受冻。

After the weather turns cooler, the staff heat the greenhouse to keep the seedlings from freezing.