The bark covering tree trunks is full of lignin, a rigid web of compounds that's tough to chew and highly impermeable to pathogens.
覆盖在树干上的树皮充满了木质素,这是一种坚硬的化合物网, 难以咀嚼,而且病原体极难渗透。
单词 | covering tree |
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原声例句
TED-Ed(视频版) The bark covering tree trunks is full of lignin, a rigid web of compounds that's tough to chew and highly impermeable to pathogens. 覆盖在树干上的树皮充满了木质素,这是一种坚硬的化合物网, 难以咀嚼,而且病原体极难渗透。 |
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