Make a comparison between these positive and negative effects, and you will find that we should spend one or two hours a day doing exercises.
比较这些积极影响和消极影响，你就会发现，我们每天都应该花一两个小时进行锻炼。
It's difficult to make accurate predictions about the effects on the environment.
很难准确预测对环境产生的影响。
Another keeper and a vet flew with the animals to make sure they suffered no ill effects from the journey.
另一个饲养员和一名兽医与这些动物一起飞行，以防它们在旅程中受到任何不良的影响。
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