Feather picking in African greys may be linked to a deficiency of the amino acid arginine, and the presence of red feathers where gray ones would normally appear may be due to a deficiency of lysine.

缺乏氨基酸精氨酸可能导致拔毛，而红色羽毛的出现可能因为缺乏赖氨酸。

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Sound is recorded in stereo, another feather in the Sensation's multimedia hat, though we found the phone unusually prone to picking up wind noise.

ENGADGET: HTC Sensation review Hands-on