grass tree trunk
草树干
以上为机器翻译结果，长、整句建议使用 人工翻译 。
The experiment shows that poplar's frost crack could prevent by the measures such as white paint, wrapping grass, tending one time and reserving grass around tree trunk.
试验证明：对杨树进行涂白、包草和抚育一遍、树干周围留草可以预防杨树冻裂。
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