• 1. series of serious problems: 尽管汽车给人们的生活带来了许多便利

• 1.The environmental management in our country face a series of serious problems, needed to be paid much attention by people.
  我国农村环境管理面临着一系列严重的问题，急需得到人们的重视和关注。
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• 2.In order to solve serious urban transport problems, according to the proved chaotic characteristic of traffic flow, a non linear chaotic model to analyze the time series of traffic flow is proposed.
  为了解决日益严重的城市交通问题，本文根据交通流已被证明的混沌特性，尝试采用非线性混沌模型来分析交通流时间序列。
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• 3.In recent years, a series of problems, such as over-hunting and loss of the habitat, have posed a serious threat to the survival of wild animals, which puts them on the edge of danger.
  近年来，过度狩猎、栖息地丧失等一系列问题对野生动物的生存构成了巨大威胁，把它们一步步推向濒危的边缘。
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