hard husk wild walnut tree 野生铁核桃
hard tree
艰难的树
以上为机器翻译结果，长、整句建议使用 人工翻译 。
Corals have hard, stony skeletons that grow like tree trunks.
VOA: special.2009.05.12
But our tree has been having a hard time recently -- this is our third one in as many years.
WHITEHOUSE: The White House
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