The acidic pH interacts with the hair's slightly negative charge to help the cuticle, the outer layer of the hair, maintain a smooth, flat surface.

酸性PH值和头发上的微量的负电荷相互作用，以此来帮助毛小皮，即头发表面的一层，保持表面光滑平整。

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In 2000-2003 tech spending was flat or negative, however Meeker's presentation included some rays of hope for entrepreneurs.

2000年到2003年的支出基本持平或略有下降，然而在米克尔的演讲中也提出了一些企业家们所拥有的希望。

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In a negative curvature model, two lines that would be parallel on a flat plane will extend away from each other.

在负曲率模型下，平面上平行的两条线可能彼此远离。

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"Flat to negative returns in gold is entirely conceivable" for 2012 if the decline in India's demand accelerates, Mr. Nadler said.

WSJ: India's Wilting Crops Tarnish Gold

When Darden was spun off from General Mills in 1995, both Red Lobster and Olive Garden were posting flat to negative same-store sales.

FORBES: Clawing back

Urban had disclosed a meager sales growth of 6% in its Q3 sales, with its major brands Urban Outfitters and Anthropologie registering flat and negative 7% comp sales respectively.

FORBES: Urban Outfitters Earnings: Despite Bad Quarter, Stock Worth $37