They stained the floors dark brown.

他们把地板涂成了深棕色。

《牛津词典》

She poured the dark brown liquid down the sink.

她把深棕色的液体倒进了污水池。

《牛津词典》

I felt her dark brown hair brushing the back of my shoulder.

我感觉到她深褐色的头发轻轻拂过我的肩后。

《柯林斯英汉双解大词典》

I never knew bread could be this good; the crust was this dark brown, sweet crust that turned chewy in your mouth.

VOA: standard.2010.07.16

But yeah, 'cause my hair is a really dark brown,

但是，因为我的头发其实是很深的棕色，

忘不了的生日礼物 - SpeakingMax英语口语达人

At the beach resort of Coolum, north of the Queensland state capital of Brisbane, dark brown waves rolled ashore instead of the usual whitecaps and aqua waters of the Coral Sea.

VOA: standard.2009.03.13

Megan is said to be 5ft 6ins, slim and has long dark brown hair.

BBC: Megan Stammers

One is described as around 5ft 6ins tall, slight build with short, dark brown hair.

BBC: Woman glassed in break-in at Porthcawl restaurant

He wore a red jail jumpsuit and sported a thick, bushy beard and unkempt dark brown hair.

NPR: Colo. Judge Enters Not Guilty Plea For Holmes