牡蛎

In experimented condition,oyster Ostrea cucullata was exposed to different concentrations of water-soluble fraction of NO.0 diesel oil (0.5,2,5 mg/L) for 15 d,and then transferred into clean sea water for 6d restoring experiment.

在实验条件下，将僧帽牡蛎分别置于含有低(0.5mg/L)、中(2mg/L)和高(5mg/L)3种浓度0#柴油水溶性成分(watersolublefraction，WSF)的海水中，在污染后1，4，7，11，15d采样，15d后转入清洁海水中进行6d的恢复实验，采样。

Toxicity effects of heavy metals and polluted dredged materials on juvenile of Sinonovacula constricta, straighthinge of Ostrea plicatula, and larvae of Artemia, larvae of Penaeus pencillatus have been studied.

研究了重金属和污染疏浚物对缢蛏Sinonvaculaconstricta稚贝和幼贝、褶牡蛎Ostreaplicatula幼虫、甲壳类的卤虫Artemiasp。

The manila clam Ruditapes philippinarum is one of the economically important seashells in our country, with Agamaki clam Sinonovacula constricta, oyster Ostrea and bloody clam Tegillarca granosa together being called "the four greatest farming seashells"traditionally.

中文摘要：菲律宾蛤仔Ruditapes philippinarum，作为我国主要的海产经济贝类之一，与缢蛏、牡蛎和泥蚶一起被称为我国传统的&四大养殖贝类&。

There is a case of an oysterlike bivalve that evolved a more and more spiraled shell until, just before extinction, the valves could barely open.

这里有个例子，一种牡蛎状双壳类，进化出越来越趋螺旋状的外壳，直到该物种灭绝，其外壳已几乎不能打开。

There is a case of an oysterlike bivalve that evolved a more and more spiraled shell until, just before extinction, the valves could barely open.

这里有个例子，一种牡蛎状双壳贝，进化出越来越趋螺旋状的外壳，直到该物种灭绝前，其外壳已经几乎打不开了。

There is a case of an oysterlike bivalve that evolved a more and more spiraled shell until, just before extinction, the valves could barely open.

这里有个例子，一种牡蛎状双壳类软体动物，进化出越来越趋螺旋状的外壳，这种进化直到该物种灭绝前未停止过，其外壳已几乎不能开合。

South sea pearls are the color of a host oyster known as the Pinctada maxima.

南海珍珠的颜色主机的牡蛎被称为大珠母贝。

South sea pearls are the color of a host oyster known as the Pinctada maxima.

南海珍珠作为著名的大珠母贝主机牡蛎颜色。

Akoya pearls are bead-nucleated culture pearls that are produced by the Pinctada fucata martensii, also known as the akoya oyster.

海水珍珠珠，有核珍珠的文化是由合浦珠母贝珠母生产，也被海水牡蛎众所周知的。

Combined with additional sequences of 20 bivalves and 6 gastropods downloaded from NCBI (National Center of Biological Institution), molecular phylogenetic trees were constructed using 4 Polyplacophora species as outgroup. The result resolved by maximum-parsimony, maximum-likelihood and Bayes-induce methods were in congruent with each other, which indicated that all bivalves formed a monophyletic group clustering with its sister-group, Gastropod.

结果显示：所有双壳纲的种类构成了单系发生的进化枝，与其姐妹群腹足纲聚在一起；双壳纲可以分为异齿亚纲和翼形亚纲两大类群，异齿亚纲是单系发生，翼形亚纲的系统发生关系则随方法的不同有所区别，牡蛎科的位置是造成此差异的主要因素。

The split between the two groups can hardly be papered over.

这两个团体间的分歧难以掩饰。

This approach not only encourages a greater number of responses, but minimizes the likelihood of stale groupthink.

这种做法不仅鼓励了更多的反应，而且减少跟风的可能性。