河流

The obvious characters are Chlorophyll-a concentration increased (The Chla concentration even reach hundreds milligramme per stere in serious area), transparence and dissolving oxygen reduced.

三峡库区蓄水后，由于水文条件发生明显改变，次级河流出现大面积富营养化现象，其显著特征就是藻类疯长引起水体Chla含量增加(在严重的累积区Chla浓度高达数百毫克/立方米)而透明度、溶解氧降低。

A dam placed across a river or canal to raise or divert the water,as for a millrace,or to regulate or measure the flow.

堰，拦河坝，挡流坝横截河流或运河以提高水位或使河水转向的坝，如用于推动水车，调节或测量水流

Mr Double, whose Canamar International makes huge plastic sheets to cover coal and grain from a plant nestled on the Minnesotan stretch of the big river, sees no signs of a slowdown.

杜布勒的卡纳马尔国际公司专门生产用于覆盖煤炭或谷物的巨幅塑料布，厂房坐落在密西西比河流经明尼苏达州的地段。

B:The Mississippi is the longest river in the world.

密西西比河是世界上最长的河流。

Warming up Mississippi River is the longest river in the world.

密西西比河是世界上最长的河流。

The Mississippi is the longest river in America.

密西西比河是美国最长的河流。

Tectonic subsidence play dominant role in their geometric shapes, basin fillings, sequence evolution and sediment distribution in the Wushi Sag. Outline of the sequences are in shape of box-wedge or sheet-wedge and boundaries of sequences are varied from bilateral fault to monoclinal fault overlap, so that the sequences show distinct semigrabens which overlay in different ways. Seven sequences were formed in different stage of tectonic evolution. The sequence of SQ1 formed in initial rift stage and deposited alluvial sequence. Sequences SQ2-SQ4 developed in intense rift stage and sediment lacustrine sequence. Sequences SQ5-SQ7 formed in late period of rift before thermal subsidence and deposit mere and delta sediment. The place adjacent to the synsedimentary fault is the subsidence center and depocenter; meanwhile, controlling fracture migrates in horizontal made subsidence and sedimentary center of the sag changed.

构造沉降是控制层序几何形态，充填叠置方式、演化及沉积体系分布的最重要因素：凹陷由多个半地堑在不同层序发育时期以不同方式叠置联结而成；受断层控制，层序外部形态有箱状-楔形、楔形-席状披覆型，边界终止方式有双断终止型、单断终止超覆型；不同构造演化阶段层序内部充填的沉积体系各具特征，初始断陷阶段的SQ1沉积冲积层序，强烈断陷阶段的SQ2-SQ4充填湖相层序，晚期断陷阶段SQ5-SQ7内部充填浅湖和河流三角洲沉积；同沉积断层陡坡带沉降迅速、可容纳空间快速增长，是凹陷的沉积和沉降中心，断陷期主控断裂活动时间和空间的变化导致了凹陷沉积和沉降中心的迁移。

Montana also has the shortest river in the world, the Roe, which is 201 feet long.

蒙大拿也最短的河流之一，雷奥，这是201英尺长。

Today we gaze out on to a silent river and a row of moored boats.

我们今天只看到一条寂静的河流，平底船在岸边被固定成一排。

The river runs somewhere close by, for I hear the call of a moorhen, and I see by your build that you're a freshwater mariner.

河流就在附近不远，因为我听到红松鸡的叫声。从你的体格看，我想你一定是一位内河水手。

Do you know, i need you to come back

你知道吗，我需要你回来

Yang yinshu、Wang xiangsheng、Li decang,The first discovery of haemaphysalis conicinna.

1〕 杨银书，王祥生，李德昌。安徽省首次发现嗜群血蜱。