在美国的肯塔基州，两只白尾鹿在青草葱葱的牧场上食草。当秋季到来，它们成熟的时候，它们红棕色的皮毛会变成灰棕色。
Twin white-tailed deer fawns feed in a grassy meadow in Kentucky, US. Their reddish-brown coats will turn to a grey-brown as they mature in the autumn.
先前的研究表明，在实施局部麻醉时，红棕色或黄棕色头发的人比其他颜色头发的人更有抗药作用。
Previous research had shown that gingers were more resistant to the effects of local anaesthesia than people with other hair colours.
在酸性水溶液中呈透明的鲜艳红色，在中性水溶液中呈红棕色，在碱性水溶液中呈透明的深红棕色。
It is not dissolved in ethanol without water, acetone, aether and grease. It is red in acid, reddish brown in neutral and dark red-brown in alkaline.
在酸性水溶液中呈透明的鲜艳红色，在中性水溶液中呈红棕色，在碱性水溶液中呈透明的深红棕色。
It is not dissolved in ethanol without water, acetone, aether and grease. It is red in acid, reddish brown in neutral and dark red-brown in alkaline.
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