Those brown spots are rot and decay.

那些棕色的斑点是腐烂。

youdao

A mare with brown spots.

和褐色地的一只母马。

youdao

The very next morning, it developed nasty brown spots.

第二天早上，上面却长了肮脏的、褐色的斑点。

youdao

Mister Hawass says that scientists have not yet been able to tell what caused the brown spots.

VOA: special.2009.12.15

Stem rust produces reddish-brown spots on the stems of infected plants.

VOA: special.2009.08.18

With my 300mm, I got some great close-ups of their bright orange and brown spots sticking out of this wall of green.

CNN: Tanzania: Make the most of your photo safari

Hands shoot up and the testimonials begin: Antioxidant-loaded XanGo calms acid reflux, cures migraines, chases away brown spots on the skin of someone's mother.

FORBES: Drinking The XanGo

Were really trying to pick our spots, says Brown.

FORBES: Serendigity