人要脸树要皮 face is as important to man as the bark is to the tree
要树皮
bark
以上为机器翻译结果，长、整句建议使用 人工翻译 。
感染冰核细菌溃疡病的杨树树皮的果胶质含量比健株略高。病株树皮游离脯氨酸含量在总体水平上要低于健株。
The ice nucleation activation bacterial canker disease decreased the content of mobile proline in poplar barks, while caused the content of bark pectin to increase a bit.
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