腔棘鱼类的

The Coelacanth is a fish that was thought to be extinct with the dinosaurs.

腔棘鱼是一种被认为和恐龙一起灭绝了的鱼类。

Contemplating the history and development of the museum profession, the comparison that springs irresistibly to mind is with the coelacanth, that remarkble creature whose brain, in the course of its development from embryo to adult, shrinks in relation to its size, so that in the end it occupies only a fraction of the space available to it.

我在考察博物馆专业的历史和发展时，常不自禁的将之拿来和腔棘鱼相比，这是一种特殊的鱼类，它的脑袋在发育过程中逐渐萎缩，以致成鱼的脑袋只占了脑壳的一小部份，与其偌大身躯几乎不成比例。

When the researchers compared the human ultraconserved element to all the DNA sequences in the public database GenBank, the closest match was to DNA from the coelacanth -- an ancient fish thought to have gone extinct millions of years ago until a live specimen was caught in 1938 off the east coast of South Africa.

该鱼类一度被认为已经绝种，直到1938年在南非的东海岸又重新被发现。腔棘鱼是一种3亿6千万年海洋生物向陆地脊椎动物进化过程中至关重要的鱼类的后裔。虽然人类和腔棘鱼的演化从那时就分道扬镳，然后经过百万年的演化人类和腔棘鱼仍然共享着类似的重要基因片断。

Sarcopterygians are a group of prehistoric fish which are traditionally classed as lobe-finned fishes, which in the real world include the modern day lungfish and the coelacanth, Latimeria.

肉鳍四脚鱼是历前鱼类的一种，传统上把它归入圆鳍鱼纲。真实世界里的圆鳍鱼有肺鱼，腔棘鱼和矛尾鱼。

Very possibly the same will happen with this book, and it isn't just the colugos and tree shrews. The position of tarsiers (Rendezvous 7), and the grouping of lampreys with hagfishes (Rendezvous 22) are unsure. The affinities of the afrotheres (Rendezvous 13) and the coelacanths (Rendezvous 19) are still slightly unsure. The ordering of our rendezvous with cnidarians and ctenophores (Rendezvous 28 and 29) could be the wrong way round.

很可能本书也会同病相怜，这不仅仅是因为猫猴和树鼩——跗猴的位置（见第7纪），以及七鳃鳗和八目鳗类鱼的分组（见第22纪）尚不能确定；远古非洲哺乳动物（见第13纪）和腔棘鱼类（见第19纪）的亲缘关系也有待商榷；而我们在刺丝胞动物和栉水母类（见第28纪和第29纪）章节的编排上也许也是一个错误。

In the negative and interrogative forms, of course, this is identical to the non-emphatic forms.

。但是，在否定句或疑问句里，这种带有"do"的方法表达的效果却没有什么强调的意思。

Go down on one's knees;kneel down

屈膝跪下。。。下跪祈祷