有时，乌鸦会拍打着黑色的翅膀，飞过公园的树梢。
Sometimes the rook flapped his black wings and soared away over the tree-tops in the park.
冰山一般是蓝色到白色，尽管有时因为携带了砾石和小岩石而变成黑色或者不透明。
Icebergs are ordinarily blue to white, although they sometimes appear dark or opaque because they carry gravel and bits of rock.
这是一部黑色喜剧，有时有趣，有时令人恐惧。
It's a dark comedy, which is sometimes funny and sometimes frightening.
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