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An animal or plant species that establishes itself in a previously barren environment.
中文意思:
先驱生物能在不毛之地生存的某种动物或植物种类


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An angry murmur ran through the crowd. 群众纷纷气愤地抱怨著.
An angular face. 瘦削的脸庞
An angular unconformable contact was for the first time found between the Middle Jurassic Bathonian Stage and its underlying pre-Ordovician metamorphosed basement in the Chawola district, in Nyainrong County. 摘要在聂荣县查吾拉区一带首次发现中侏罗统巴通阶与下伏前奥陶系基底变质岩系之间呈角度不整合接触。
An animal keeper plays music for giant panda Taotao, in case it feels lonely in the Zoo of Jinan, capital of east China's Shandong Province, Nov. 29, 2006. 11月29日,济南动物园的饲养员为大熊猫“桃桃”播放音乐,帮它消除寂寞。
An animal kept for amusement or companionship. 宠物用于娱乐消遣或陪伴的动物
An animal or plant species that establishes itself in a previously barren environment. 先驱生物能在不毛之地生存的某种动物或植物种类
An animal park provides a close-up look at wolves, reindeer and elk, as well as typical farm animals. 还有一个动物园可以让人近距离好好地看看狼、驯鹿、麋鹿,和一些典型的牧场动物。
An animal rights group called on Tuesday for a North American theme park operator to cancel a competition in which people will try to break the world cockroach-eating record. 周二,动物保护组织呼吁北美主题公园经营者取消吃蟑螂世界纪录赛。
An animal species becomes extinct when it fails to produce enough young in each generation to keep pace with the death rate. 一种动物如果不能在每一代都生下足够的后代来与死亡率抗衡的话,它们将走向灭绝。
An animal species becomes extinct when it fails to produce enough young is each generation to keep pace with the death-rate. 不论何种动物,只要每一代不能繁殖出足够的后代,不能与这种动物的死亡数字相平衡,那么这种动物就会逐渐灭绝。
An animal species will become extinct if it fails to produce enough young in each generation. 一个动物物种如果不能在每一代生育足够数量的后代,那它就要灭绝.
 
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