Only a few rare species are known to produce the toxic trichothecenes.

只有一些稀有物种产生有毒的单端孢霉烯。

They are investigating the autecology and natural history of rare species.

他们正在调查稀有物种的起源和自然史。

This is a very rare species.

这是一种稀少的鱼。

Epaulette sharks are not among the rare species.

肩章鲨鱼不属于稀有物种。

Women film directors in Hollywood are a rare species.

女性电影导演在好莱坞属于稀有物种。