一对

Certain of the snakes, such as Crotalus, Bothrops, Lachesis, Trimeresurus, and Agkistrodonpossess a pair of pit organs which enable snakes to detect and capture prey animals in the dark.

许多蛇类，例如响尾蛇属，洞蛇属，饭匙倩蛇属，竹叶青蛇属和蝮蛇属等在头部具有一对能在黑暗中探测和捕获猎物的凹陷器官。

This not only makes it comfortable for the lady to follow the man's lead, but also gives the couple a deportment of regal appearance.

这不仅使得舒适的夫人跟随男方铅、而且一对夫妇的举止富豪露面。

A kidneylike organ, being either part of the most anterior pair of three pairs of organs in a vertebrate embryo, disappearing early in the embryonic development of higher vertebrates, but functioning as a kidney in some simple vertebrates, such as the lamprey.

前肾，原肾一肾状器官，是脊椎动物胚胎中三对器官最前面一对的一部分，在高级脊椎动物的早期发育时消失，但在一些初级脊椎动物中作为肾脏，如八目鳗

A kidneylike organ,being either part of the most anterior pair of three pairs of organs in a vertebrate embryo ,disappearing early in the embryo nic development of higher vertebrates,but functioning as a kidney in some simple vertebrates,such as the lamprey.

前肾，原肾一肾状器官，是脊椎动物胚胎中三对器官最前面一对的一部分，在高级脊椎动物的早期发育时消失，但在一些初级脊椎动物中作为肾脏，如八目鳗

A pair of curved vertical supports for a lampshade.

灯座的一对弯曲的竖直支撑。

The landing craft are expected to touch down on Mars in January 2004 and deploy the robot rovers shortly thereafter.

这是由美国太空总署开发的太空探测器，是一对一模一样的探测器，分别会在6月8日及25日发射，2004年1月会抵达火星。

Big cock of the fire, turning his neck, and back to their own picks, small insects, dancing, jumping to his head, a pair of open laniary, like pliers-like tightly bite his red crest, Big cock pain disorder hop thrown.

大公鸡火了，他转动脖子，往自已的背上啄去，小虫子又跳，跳到他的头上去，张开一对大牙，像钳子似的紧紧地咬住他的红冠子，大公鸡痛得乱蹦乱叫。

Listen carefully; speak much; read widely; learn...by heart; practise writing;...

十、书面表达训练（10）小明和小华是在"手拉手"活动中结成的一对学习伙伴。

The liqase was positively controlled by HAI and AI-2 to some extent. The lecithinase was negatively controlled by HAI-1, and the hemolysin was negatively controlled by both HAI-1 and AI-2. Special primers of luxS gene were designed from the luxS gene sequence of V. harveyi obtained from the GenBank, and the gene was amplified from a pathogenic strain V. harveyi VIB645 by PCR. The luxS gene was cloned to a cloning vector pUC, and was sequenced. It was found that the open reading frame is 519 bp. The similarity of the luxS gene from V. harveyi VIB645 to the published sequence of V. harveyi strain in GenBank was only 90%.

从GenBank中获取哈维氏弧菌中编码AI-2合成酶的luxS基因序列设计一对特异性引物从哈维氏弧菌VIB645中PCR扩增luxS基因，将luxS基因克隆于pUC载体并测序，发现其与GenBank中已发表的哈维氏弧菌的luxS基因序列相似性为90%，证明LuxS/AI-2系统在哈维氏弧菌不同的菌株中的具有一定的特异性，推测LuxS/AI-2系统可能与哈维氏弧菌的致病性或发光现象有关。

The legend is that when Leda was fecundated she gave birth to twins.

传说勒达怀孕后生了一对双胞胎。

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