... 石棉内芯 astestos inner core 聚光灯泡 focus bulb 低压避雷器 low-pressure lightning arrestor ...
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focus bulb
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以上为机器翻译结果，长、整句建议使用 人工翻译 。
The research will focus on the current two main threats to the cereal crop: wheat bulb flies that attack the roots, and cereal aphids that tackle the tops of plants.
BBC: Broccoli (Image: BBC)
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