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。
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。
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。
In recent years, large scale urban constructions have brought on a series of serious urban problems, which desiderate urban renovation and reconstruction immediately.
然而近些年来，该地区内的大规模建设引发了一系列严重的城市问题，亟待整治改造。
During the land usage, a series of problems occur time to time, such as irrational land use structure, low degree of intensive usage, land resource degradation, serious loss of arable land.
在土地利用中，用地结构不合理、集约利用程度低、土地资源退化、耕地流失严重等一系列问题时有发生。
But the use of much fertilizer results in decreasing of quality and a series of serious entironment problems.
但化学肥料尤其是氮肥施用量过多，极易导致产品质量下降、环境污染等问题。
But the use of much fertilizer results in decreasing of quality and a series of serious entironment problems.
但化学肥料尤其是氮肥施用量过多，极易导致产品质量下降、环境污染等问题。
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