Many pesticides are highly toxic.

许多杀虫剂毒性很大。

《牛津词典》

But nor would I expect them to be highly toxic.

但我觉得它们的毒性不会太大。

youdao

Dioxins are of concern because of their highly toxic potential.

二恶英之所以引起关注是因其具有非常大的潜在毒性。

youdao

Which is a good thing, because modern systemic pesticides have made them highly toxic.

NPR: Robb Walsh: 'Are You Really Going to Eat That?'

Michigan's Kalamazoo River is polluted by polychlorinated biphenyls (PCBs), highly toxic chemicals banned in the 1970s.

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Serious concerns have been raised here over levels of highly toxic dioxins in the emissions from the plant.

BBC