It is a staple crop cultivated for its large, starchy, spherical tubers, which, though poisonous raw, become edible with heating.

是主要农作物之一，其地下块茎大，圆球形，富含淀粉。生食有毒，但煮熟后可以食用。

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Though there are more eatable plants, there may also be wild animals, poisonous snakes, and other hazards.

虽然沿途有更多的可食用植物，但同时也可能有野兽、毒蛇和其他的危险。

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Some harmless looking plants, though tasty, prove to be poisonous.

有些植物看起来无害，吃起来美味，但却是有毒的。

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Alas, though, the case is symptomatic of the poisonous politics in the U.S. today.

FORBES: Magazine Article

Those same polls, though, show that Cheney is more polarizing and poisonous to swing voters now.

FORBES: Magazine Article

This week's conviction, though expected, has injected even more venom into Italian political life, poisonous enough already.

ECONOMIST: Italy: The prison door | The