淡水

Similar to Atlantic salmon, but unlike their Pacific Oncorhynchus kin, steelhead are iteroparous and may make several spawning trips between fresh and salt water.

与大西洋鲑类类似，但不像他们的太平洋大马哈鱼近亲，刚头可以在幼态与性成熟态之间转换，在海水和淡水之间完成数次产卵旅程。

Any of various large food and game fishes of the genera Salmo and Oncorhynchus,of northern waters,having delicate pinkish flesh and characteristically swimming from salt to fresh water to spawn .

大麻哈鱼北部海域中□属和大麻哈鱼属的各种大食鱼或猎物鱼，具有柔嫩粉红色肉，特征是从咸水游到淡水中去产卵

Siluriformes belonging to Ostariophysi, Teleostei, is a group of fishes that are mainly lived in freshwater and broadly distributed in all continents.

鲇形目隶属硬骨鱼纲、骨鳔鱼类，是一类主要生活在淡水、广泛分布于世界各大洲的鱼类。

Any of various minute, chiefly freshwater crustaceans of the subclass Ostracoda, having a bivalve carapace.

介形亚纲动物属介形亚纲的任一种体小的、主要生活于淡水中的甲壳纲动物，长有一对硬壳

The study on microstructure characteristics of the five pores on the surface of ostracoda at Nenjiang Formation of Songliao Basin in Cretaceous shows that during the depositional period of Nenjiang Formation in Cretaceous,Songliao Basin should be a continental depositional system and palaeolacustrine enviroment and furthermore its water body property should be fresh saltish.

本文对松辽盆地白垩纪嫩江组介形类化石壳体表面毛细管孔的显微构造特征研究表明，白垩纪嫩江组沉积时期，松辽古湖盆应为一陆相沉积体系，其水体性质应为淡水—少盐水的古湖泊环境。

Because nitrogen oxides were already present on early Earth, our finding opens up the possibility that oxygen was available to microbial metabolism before the evolution of oxygenic photosynthesis.

同时，由于亚硝酸盐通过化肥的使用而在淡水农业土壤中大量存在，新的研究结果也可为肥料在甲烷循环中的利用提供契机。生物谷 Bioon.com

The endemic species of Chinese freshwater bivalves are dominated by species in central part of China, Oriental realm, with a few species in Palearctic realm. The endemic species spread over 16 provinces, mainly distributed in Jiangxi, Hunan, Anhui, Zhejiang and Jiangsu provinces.

我国淡水双壳类特有种的组成和区系成分，以东洋界华中区的种类占绝对优势，仅有少数种类渗透到古北界；特有种在我国16个省有分布，但主要集中分布于江西、湖南、安徽、浙江、江苏五省。

According to the nature of the water sources, wetlands can be classified into six types: marine, estuarine, lacustrine, riverine, palustrine (found in marshes, swamps and bogs) and artificial.

按水源界别，湿地可分为六大类：海洋、河口三角洲、湖泊、河滨、淡水（位於沼泽、草泽及苔地的湿地）和人工湿地。

Wetlands could be classified into 6 types that they are marine, estuarine, lacustrine, riverine wetlands along rivers and streams, palustrine (wetlands in marshes, swamps and bogs and artificial.

湿地可分为6大类──海洋、河口三角洲、湖泊（包括与湖泊有关连的湿地）、河滨（包括与河溪相关连的湿地）、淡水（包括位於沼泽、草泽及苔地的湿地）和人工湿地。

Using a mean age concept defined by Deleersnijder, we apply the three-dimensional hydrodynamic and eutrophication model HEM-3D to investigate the pollutant age distribution under different river discharge conditions in the Pamlico river estuary, North Carolina.

根据Deleersnijder定义的一个平均年龄概念，运用耦合了物质输运模式的一个三维水动力－富营养化数值模型(HEM-3D)，研究了位于美国北卡罗莱纳州Pamlico河口的污染物输运时间在不同淡水流量影响下的分布情况。

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。