Rats and other animals need to be highly at tuned to social signals from others so that they can identify friends to cooperate with and enemies to avoid.
老鼠和其他动物需要高度关注来自别的动物的社交信号，以便它们识别哪些是可与之合作的朋友或需要避免的敌人。
Rats and other animals need to be highly attuned to social signals from others so they can identify friends to cooperate with and enemies to avoid.
老鼠和其他动物需要对来自其他动物的社会信号有高度的协调性，这样它们才能分清哪些是可以合作的朋友，哪些是要躲避的敌人。
"I don't believe that they had a three-second memory because animals need their memory, so they build up over time knowledge of where the food is," said Roy Stokes, a student at the Australian Science and Mathematics School.
澳大利亚科学与数学学校的学生罗伊·斯托克斯说：“我不认为它们有三秒钟的记忆，因为动物需要记忆，这样它们就会随着时间的推移逐渐了解食物在哪里。”
Reduced reliance on chemicals in agriculture is part of the solution, says Buchmann, since all animals need their immune systems in top shape to combat pathogens in their environment.
布克曼认为，减少对化学物质的依赖也是部分的解决之道，因为为了对抗环境病原体的侵入，所有动物的免疫系统都要保持最佳状态。
Plants need soil, and animals need food.
植物需要土壤，动物需要食物。
What do human beings, plants and animals need to survive?
人类生存的条件和动植物生存的前提是什么？
Hunting animals need hunting grounds. And that inevitably brings them in conflict with humanity.
肉食动物需要捕食场地，但这与人类活动不免发生冲突。
All plants and animals need nitrogen. Nitrogen is a major element in the proteins in our bodies. The atmosphere is mostly nitrogen.
所有动植物都需要氮。氮是人类身体中蛋白质的主要组成部分。大气中也主要是氮气。
Animals need to eat many portions of plants to produce one portion of meat.
动物长一点肉需要吃掉大量植物。
Animals need to eat many portions of plants to produce one portion of meat.
动物长一点肉需要吃掉大量植物。
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