The logs should from come hardwood trees like maple, oak, poplar or birch.

原木应该来自枫树、橡树、杨树或桦树等硬木树木。

Historically, these durable black hardwood trees were used for building furniture, cabinets, even piano keys.

历史上，这些耐用的黑色硬木被用来制造家具，橱柜，甚至钢琴琴键。

Some of the vegetation on these islands like hardwood trees, are particularly sensitive to fluctuations in water levels.

岛上的一些植物，比如硬木树，对水位的波动非常敏感。

Bald Eagles like to nest  in old growth coniferous or hardwood trees.

白头鹰喜欢在古老的针叶树或阔叶树上筑巢。

Large fruit eaters such as this one spread the seeds of tropical hardwood trees in their dung, helping to build up forests, which absorb carbon dioxide from the atmosphere.

像这只猴子这样的大型食果动物通过粪便传播热带硬木树的种子，有助于森林的扩张，而森林能够从大气中吸收二氧化碳。