The Ricci map gained the nickname the "Impossible Black Tulip of Cartography" because it was so hard to find.

利玛窦的地图被称为“地图学上不可能的黑色郁金香”，因为它很难被找到。

youdao

I think the black bread is too hard for grandmother to eat.

我觉得这黑面包太硬了，奶奶吃不下去。

youdao

Now you won't have to eat hard black bread any more for a little while.

现在你可以有一段时间不用再吃干硬的黑面包了。

youdao

And,she worked hard to end violations against the rights of black people.

VOA: special.2010.03.28

Black worked hard to market herself.

FORBES: Cathie Black Out as NYC Schools Czar? You Don't Say.

One reason why so many black women strive so hard is because they do not expect to split the household bills with a male provider.

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For his twelfth birthday, Sandy had gotten a large, flat black portfolio made of hard cardboard that folded along a sewn seam and was secured at the top edge with two attached lengths of ribbon that he tied in a bow in order to fasten the leaves.

NPR: Roth Rewrites History with a 'Plot Against America'