The techniques included new methods to identify viruses in sweet potato roots, and better systems for multiplying improved virus-free plant varieties.

这些技术包括辨认甘薯根内病毒的新方法以及扩大经改良无病毒作物品种的更好方法。

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More recently, new celery varieties and potato varieties have been introduced that were found to have natural toxicants that are harmful to some people, including farm workers who handle the crops on a daily basis.

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