Cryptosporidium and Giardia axe two common species of pathogenic protozoan, seriously endangering the water quality.
隐孢子虫和贾第鞭毛虫是两种严重危害水质安全的病原性原生动物。
"At first I thought it was a common species," Thy said in a press release. "But looking closer, I realized it was something I didn't recognize."
Thy在一份新闻稿中说“起初，我以为它是普通物种，但仔细观察后，才意识到我根本不认识这个家伙。”
There are 109 common species including great commorant, little egret, swan goose, osprey, common crane, Indian cuckoo and light-vented bulbul etc.
常见种109种，如普通鸬鹚、白鹭、鸿雁、鹗、灰鹤、四声杜鹃、白头鹎、黑卷尾、红嘴山鸦等。
In another example, some previously common species of sea cucumbers at Station m virtually disappeared after 1998, while others became much more abundant.
在另一个例子当中，在1998年以后，M海域中一些以前常见的海参品种几乎已经消失，但同时其他种类的海参却变多了。
Any of various deep-bodied marine food fishes of the family Sparidae, especially a common species Pagrus pagrus of Mediterranean and Atlantic waters.
真鲷鲷科各种深色海洋食用鱼之一种，尤指较常见的赤鲷，其生活于地中海和大西洋中。
Time spent outdoors is down, roaming ranges have fallen drastically, activity levels are declining and the ability to identify common species has been lost.
孩子们的户外活动时间减少，活动范围急剧缩小，活动水平下降，识别常见生物的能力丧失。
And the statistics of 33 species of birds, by means of meeting frequency index, show that there are 5 dominant species, 8 common species and 20 rare species.
并对33种鸟采用遇见频次指数法进行数量统计，其中优势种5种，常见种8种，稀有种20种。
The present paper deals with 10 common species of the genus Tetragnatha found in paddy field, from China, with brief descriptions and diagnostic illustrations.
本文报道了我国稻田肖蛸属1 0种蜘蛛，每种具简明扼要的描述和精确的鉴别特征图。
In this paper the writers have studied the faunal composition, the dominant and common species of birds reproduced with different vertical zones in the Muli and the resources types of birds.
报道了木里县鸟类的区系组成、特点以及优势种、常见种和资源鸟类的类型。
Delta forest undergrowth landscape. There were 24 plots whose vine species were less than 4. Smilax china, Millettia dielsiana, Tetracera asiatica, Lygodium flexuosum were vine common species.
藤本植物中菝葜、山鸡血藤、锡叶藤、曲轴海金沙为常见种，有24个样地的藤本植物的物种数少于4种。
The similarity coefficients of the predatory arthropod communities in the weed habitat and the rice field were over 0.5, indicating many common species of predatory arthropods in the two habitats.
杂草地与稻田两生境间的捕食性节肢动物群落的相似性系数大于0.5，由此可见，这两类生境中捕食性节肢动物的物种组成是非常相似的，具有较多的共有种。
The common ancestor is, however, too recent for the new species to be a remnant of the first human excursion from Africa.
然而，共同的祖先对于新物种又太现代，而不能作为来自非洲的人类首次远足的遗迹。
The common ancestor is, however, too recent for the new species to be a remnant of the first human excursion from Africa, the one that led to Java man and Peking man, now known as Homo erectus.
然而共同的祖先对于新人种又太现代，而不能作为来自非洲的人类首次远足的遗迹，那次远足产生了现在被称为直立人的爪哇猿人和北京猿人的祖先。
It found that the most common threat was habitat loss, while other factors that threatened the plants included invasive species and pollution.
这项研究发现最常见的威胁是生境丢失，而其它威胁着食肉植物的因素包括入侵物种及污染。
Back in 1994 they devised an algorithm to determine a sustainable catch of the most common whale species despite continuing uncertainty about how abundant they are.
早在1994年他们就发明了一套可以确定一个对大多数普通种类的鲸鱼可以忍受的捕杀数量的运算方法，尽管仍然不清楚它们的丰度怎样。
A model that had a single common ancestor and allowed for some gene - swapping among species was even better than a simple tree of life.
一个拥有单一共同祖先且允许物种间部分基因彼此交换的模式甚至更优于树形生命模式。
But unlike most tree species common in the us, the ginkgo is dioecious, meaning trees are male or female.
但是银杏树和美国常见的树种不同，它是雌雄异株植物，也就是说银杏树有分雄性和雌性。
Many ornithologists specialize in very rare or endangered bird species rather than focusing on more common birds.
相对于关注常见鸟类，很多鸟类学家更是稀有和濒危鸟种的专家。
The extinctions differ from species to species, and we don't find any common genetic characteristic to distinguish extinct from surviving species.
各个物种的灭绝原因都不相同，而且找不到任何遗传特性来区别灭绝物种与存活物种。
The most common sources of meat are domesticated animal species such as cattle, pigs and poultry and to a lesser extent buffaloes, sheep and goats.
肉类最常见的来源是驯养的动物品种，如牛、猪和家禽，其次是水牛、绵羊和山羊。
Instead of knowledgeable readers and writers, you will sometimes risk finding a common illiterate species: the Internet troll.
如果不是知识广博的读者和作者，有时会陷入一种无知的阶段：网络巨魔。
Marine reserves are common in the tropics, butpolicymakers in temperate countries tend to focus on one species at atime to control numbers of that species caught.
海洋资源在热带地区是共有的，但是温带地区国家的政策制定者们往往一次只重视对某一个物种的捕捞量进行控制。
Clearly, his achievement of uniting all species under a common ancestor outraged millions, and still does.
显然，他把所有物种统一到一个共同祖先的成就激怒了数以百万计的人，现在依然如故。
Rod cells were the most common types of photoreceptor found in all 17 shark species, which means the predators should be able to see within a wide range of light levels.
在17种鲨鱼的视网膜中，最常见的感光体是视杆细胞，这意味着鲨鱼在不同的亮度环境下都可以看得到外界。
He identified the turtles as Diamondback terrapins, a species common to Jamaica Bay, which surrounds the airport.
他鉴定机场附近的这些海龟为钻纹龟，这种海龟在牙买加海湾很常见。
This is Myotis tricolor, a relatively common savanna species that is widespread across Africa.
上图是一只南非鼠耳蝠，是一种在相对普遍的热带稀树草原物种，广泛分布于非洲。
This species of horseshoe bat, Rhinolophus blasii, was very common, making up roughly 70 percent of all the individuals that we captured in and around this site.
这种布氏菊头蝠很常见，我们在此地捕获蝙蝠中的70%都是这种蝙蝠。
This species of horseshoe bat, Rhinolophus blasii, was very common, making up roughly 70 percent of all the individuals that we captured in and around this site.
这种布氏菊头蝠很常见，我们在此地捕获蝙蝠中的70%都是这种蝙蝠。
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