By paralyzing the facial muscles used for frowning, Botulinum Toxin a - or Botox - prevents people from physically displaying expressions of negative emotion.

通过麻痹用于皱眉的面部肌肉，A型肉毒毒素或肉毒杆菌毒素使人们无法表达人体自然流露的消极情绪。

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They were close to weaponizing ricin - a lethal plant toxin.

他们快把蓖麻毒素——一种致命的植物毒素——研发成武器了。

《柯林斯英汉双解大词典》

Postmortem analysis showed the presence of an as yet unidentified virus, as well as evidence of a known bacterial toxin.

尸检分析显示存在一种尚未识别的病毒，以及一种已知细菌毒素的证据。

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Its toxin is used as a heart stimulant and as a diuretic as well a remedy for sinusitis and toothache.

VOA: standard.2010.02.07

Larger fish that eat smaller fish can have concentrations of toxin a thousand times higher than the levels found in the river's sediment.

CNN: Pregnant women should follow guidelines on eating fish

Dr Peter Chait and colleagues told an annual meeting of the American Roentgen Ray Society how injections of botulinum toxin A into the salivary glands helped 70% of children with cerebral palsy and severe drooling.

BBC: NEWS | Health | Botox 'helps to prevent drooling'

Here's a brief science lesson: Botox is a brand name for botulinum toxin type a.

CNN: Paging Dr. Gupta Blog