这条浮油看起来似乎一条灰色的形状，迅速地朝向北方的一堆云群。
The slick appears as an uneven grey shape immediately north of a bank of clouds.
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一堆堆的云沿着西边的地平线积聚起来了。
A bank of clouds had built up along the western horizon.
《柯林斯英汉双解大词典》
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