gray mould

例句：

1. 1.The old wooden table was covered in gray mould.
   那张旧木桌被灰色的霉菌覆盖了。
2. 2. The moldy bread gave off a foul smell.
   发霉的面包散发出难闻的气味。
3. 3. The scientist discovered that the mold had been growing on the food for weeks.
   科学家发现，这种霉菌已经在食物上生长了几周。