淡水的

This study firstly provides new approach for quantitative risk analysis and simulation of the managing fresh-water fisheries and ecosystem using Ecopath with Ecosim model.

本研究首次进行了淡水生态系统与渔业发展的定量性风险分析，在成功建立EwE模型的基础上，将某些功能组进一步细化，发展了以1991－1995年数据为基础的EwE优化模型。

Darwin discussed about some anomalous forms in fresh water basins, which belong to the remnants of some interesting orders. Because these anomalous forms exhibit the anomaly of geographical distribution e.g. Ganoid fishes, or morphological anomaly such as Ornithorhynchus and Lepidosiren , they may be called living fossils. It is believed that Darwin presented the facts of the above anomalous forms, and used the term "living fossil" in order to further illustrate the subject of "Circumstances Favorable for the Production of New Forms Through Natural Selection" in Chapter IV. The term "living fossil" appears on page 486 again in the last Chapter, i.e. Chapter XIV "Recapitulation and Conclusion", where Darwin emphasized the significance of so-called "living fossils".

第一次在该书第四章"自然选择"（第107页）：为了在该章深刻阐述"通过自然选择产生生物新类型的有利条件"这一主题，达尔文谈到了淡水流域中残存着地理分布或形态上很异常的一些生物，如：硬鳞鱼、鸭嘴兽和美洲肺鱼，可以称之为"活化石"；第二次是在该书最后一章"复述与结论"（第486页），达尔文对"活化石"的作用进行了小结。

According to USACE hydrologist Stan Simpson, the organisation carefully plans the river's flow in order to meet the changing needs of the fish; software provided by TNC calculates how much water to release according to the time of year and weather.

美国陆军工程兵团淡水管理专家斯坦。辛普森先生说，他们细心地调整旱季和雨季、春天和冬天鱼类不同需求下的水量。用大自然保护协会提供的软件可以计算出不同时期、气候情况下的放水量。

So, if we were to choose hydroponic farming for most of our crops, we could save a tremendous amount of fresh water.

因此，如果我们要选择水养殖的大部分我们的庄稼，我们就可以节省大量的淡水。

The study shows that the ancient Yaoguan Lake Basin with plenty of water was a source of fresh water for ancient people.

研究表明，距今3万年前的姚关古湖盆地还有大量的水资源，是古人类的淡水水源地。

Large anadromous lamprey sometimes used as food; destructive of native fish fauna in the Great Lakes.

有时被食用的淡水产卵的大鳗鱼；北美五大湖本地鱼类区系的破坏者。

The freshwater ichthyofaunas mainly from northern China are characterized by primitive actinopterygians,and they are closest to those from Siberia and Middle Asia,and also contain some forms similar to the fishes from other regions of Laurasia and the Gondwanan continents.

与当时"南海北陆"的古地理格局一致，淡水鱼类主要分布于北方大陆的河湖相盆地，但也见于扬子板块与北方大陆碰撞后的四川盆地；海生鱼类则主要分布于华南和喜马拉雅地区。

To be noticed that the spiral grains on the surface of nacreous layer of Hyriopsis schiegeli shells and its pearls are rarely found in other fresh water cultured pearls.

值得注意的是，在池蝶蚌贝壳及其珍珠的珍珠层表面出现螺旋状纹理，这种现象在其它的淡水珍珠（如三角帆蚌贝壳及其珍珠）中极为少见。

The Hope Pearl is a white drop-shaped freshwater blister pearl, thought to be one of the most famous pearls, and perhaps the largest saltwater specimen in existence.

珍珠的希望是一种白色下降形水泡淡水珍珠，被认为是最著名的珍珠之一，也许是最大的咸水湖存在标本。

Wetland refers to natural or artificial, permanent or temporary marshes, peat bog and waters(motionless or flowing, fresh water or salt water) including sea area no deep than 6m in low tide.

湿地是指天然或人工的、永久或暂时性的沼泽地、泥炭地和水域（有静止或流动、淡水或咸水水体），包括低潮时水深浅于6米的海水区。

We have no common name for a mime of Sophron or Xenarchus and a Socratic Conversation; and we should still be without one even if the imitation in the two instances were in trimeters or elegiacs or some other kind of verse--though it is the way with people to tack on 'poet' to the name of a metre, and talk of elegiac-poets and epic-poets, thinking that they call them poets not by reason of the imitative nature of their work, but indiscriminately by reason of the metre they write in.

索夫农 、森那库斯和苏格拉底式的对话采用的模仿没有一个公共的名称；三音步诗、挽歌体或其他类型的诗的模仿也没有——人们把&诗人&这一名词和格律名称结合到一起，称之为挽歌体诗人或者史诗诗人，他们被称为诗人，似乎只是因为遵守格律写作，而非他们作品的模仿本质。

The relationship between communicative competence and grammar teaching should be that of the ends and the means.

交际能力和语法的关系应该是目标与途径的关系。