They get dirty and develop a condition called flystrike, which occurs when flies lay eggs on their wool and these then hatch into maggots.

它们会变得脏兮兮的，而且还会得蝇蛆病——就是苍蝇会在它们的羊毛中产卵，然后这些卵会孵化出蛆。

youdao

'They get dirty and develop a condition called flystrike, which occurs when flies lay eggs on their wool and these then hatch into maggots. '

它们会变得脏兮兮的，而且还会得蝇蛆病——就是苍蝇会在它们的羊毛中产卵，然后这些卵会孵化出蛆。

youdao

'They get dirty and develop a condition called flystrike, which occurs when flies lay eggs on their wool and these then hatch into maggots. '

它们会变得脏兮兮的，而且还会得蝇蛆病——就是苍蝇会在它们的羊毛中产卵，然后这些卵会孵化出蛆。

youdao