它们被正式地列为有害动物，农民们试图通过射杀或投毒来减少它们的数量。
They are officially classified as harmful and farmers try to keep their numbers down by shooting or poisoning them.
我们需要记住，要治疗疾病，新药必须通过临床试验，尽管这类药可能还没有被正式列为认知增强类药物。
Remember that the new drugs will have passed clinical trials because they are treatments for a disease, even if they have not been licensed as cognitive enhancers.
自由式滑雪空中技巧运动于90年代初被正式列为全国冬季比赛项目。
The aerials in freestyle-skiing was formally listed as the national winter event at the beginning of 90s.
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