When Barack Obama entered the White House in January 2009, he set out to erase the stain such practices have left on America's image.

2009年1月，巴拉克·奥巴马入驻白宫时，计划擦掉这种行为留在美国形象上的污点。

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The sulfur leaves a pale yellow stain that almost seems to glow in the lower image, a photo taken from a helicopter in July 2006.

硫磺留下的淡黄色痕迹，在2006年直升机拍摄的照片(下图)中更加鲜艳夺目。

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Methods: Primary embryonic rat cortical neurons culture, cytotoxicity assays and biochemistry detection, cell stain for the neuron morphology in microscopy and image analysis.

方法：原代胚胎鼠皮质神经元细胞培养，细胞毒性试验及生化指标测定，细胞染色，显微镜下观察形态学改变及影像分析。

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Already found to be of limited use as a pitchman by corporate America, Clemens stands no chance if steroids and HGH continue to stain his image.

FORBES: The Rocket, Inc.