bitter-bark 树皮苦涩 ; 树皮苦涩的树木
bitter willow bark 水杨木白皮
N an Australian tree, Alstonia constricta, with bitter-tasting bark that is used in preparing tonic medicines 苦皮树
White Willow Bark is an herb common to Native American and Chinese cultures. It has a bitter taste when brewed as tea.
白柳树皮是美国土著和中国文化中常见的草本，在冲泡作茶饮时略带苦味。
youdao
Patience is a tree with bark bitter but fruit sweet.
忍耐就象一棵树，虽然树皮饱受钻洞之苦，果实却依然甜美。
As far back as the fifth century BC Hippocrates used a bitter powder obtained from willow bark to ease aches and pains and reduce fever.
BBC: Aspirin: A century of good news
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