Like natural brown fat, the engineered cells burned calories at an astonishing rate.

像天然灰色脂肪一样，这些工程细胞能以一种惊人的速度燃烧这卡路里。

youdao

The key to the procedure is a specially tuned laser that destroys the natural brown pigment melanin in the iris, the eye's central colored portion.

手术的关键是一种特殊的调谐激光器，它可以破坏虹膜(眼睛中部有颜色的部位)内天然的“褐色素”内的黑色素。

youdao

Materials and colors are based on nature. Wood, stone and natural brown ceramic tiles shape this dwelling and create a welcoming and warm yet elegant ensemble.

材料和颜色以自然为基础。木材、石头和自然棕色瓷砖建造了这个住所，并创造了友好温馨而雅致的整体。

youdao

Brown rice is the grain in its natural form.

VOA: special.2010.06.30

The four individual seats and the door center panels are upholstered in natural leather in a rich brown tone.

ENGADGET: Mercedes-Benz GLA concept puts laser projectors in headlights, redefines SUV

Mr Brown is a more natural and skilled politician, and has sought to portray his rival as a Harvard snob and himself as a man of the people.

BBC: US election: Six crucial Senate races

Landscape painters struggled with treacherous greens that turn brown and with the irksome fact that brown itself is not a natural hue (try finding it in a rainbow).

ECONOMIST: Science and history of colour