比如说经过加工的加拿大枫木比热带的印茄木和孪叶苏木的硬度还要高。
Treated Canadian maple, for example, is harder than tropical merbau and jatoba.
它的第一次出现，是印度河谷的居民发现木蓝属植物的叶子在干枯之后变成深蓝色，且发酵之后的浆状物会牢固地印在衣服上。
It first appeared when residents of India's Indus Valley discovered that the leaves of indigo plants turned dark blue when dried and, as fermented pulp, clung attractively to garments.
用木印不容易得到清晰的印记。
用木印不容易得到清晰的印记。
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