哺乳动物

The aardvark is a mammal that burrows into the ground to catches ants and termites.答案:D

翻译参考：土豚是一种可以在地上打洞捉蚂蚁和白蚁的哺乳动物。

The aardvark is a mammal that burrows into the ground to catches ants and termites.

参考译文：土豚是一种可以在地上打洞捉蚂蚁和白蚁的哺乳动物。

Elevated levels of both these chemicals lead to heightened alertness and stimulate the forlorn animal to call for help and search for its abandoner- generally its mother.

上述两种化学物质在哺乳动物体内的浓度水平的升高会导致它们的警惕性提高并且激励它们从他们的抚养者那里获得帮助--通常是他们的母亲。

Because these viruses abortively infect human and most mamralian cells yet still effecfivelypresent encoded forgein genes to the host inmune system Compared with the replication-compentent vaccinin virus,the MVA modified vaccinia Ankara ,all a highly attenuated vaccinia virus,lost hte ability to replicate in human and most mamralian cells except BHK-21 and CEF cells.

痘苗病毒做为一种载体在外源抗原蛋白的递呈方面有着很大的潜力。因为这类病毒不能感染人和大多数哺乳动物细胞，却可以有效地将外源基因编码的蛋白递呈给宿主免疫系统。

Abstract］ A certain number of neural stem cells exist in the embryonic and adult mammalian brain.

摘要］ 胚胎和成年哺乳动物脑内均存在神经干细胞。

The main collagens in skin are type I and III. In this research, total collagens were separated from rat skin by enzymatic digest and acetum methods. The collagens were denatured at 60℃ and digested with trypsin. Characteristic peptides typical for collagen type I and III were identified with high performance liquid chromatography/mass spectrometry.

哺乳动物皮肤真皮中胶原蛋白含量约为70%，主要为是I型、III型胶原蛋白，本实验利用稀酸溶解和酶法提取了大鼠皮肤中的总胶原蛋白，将胶原蛋白粗提品在60℃变性后用胰蛋白酶进行降解，液相色谱/质谱联用法分析了两种胶原蛋白的特征多肽，利用特征多肽比较了不同生长期大鼠皮肤中I型和III型胶原蛋白相对含量。

ACTH is found in vertebrate s; in mammals it contains 39 amino acids.

促肾上腺皮质激素在脊椎动物均有发现，在哺乳动物中它包含了三十九种氨基酸。

ACTH is found in vertebrates; in mammals it contains 39 amino acids.

促肾上腺皮质激素在脊椎动物均有发现，在哺乳动物中它包含了三十九种氨基酸。

Although over 1% of adenine is methylated in bacteria, methyladenine has not been found in mammalian genomes so far.

在细菌中，超过1%的腺嘌呤是被甲基化的，而哺乳动物的基因组中还没有发现甲基腺嘌呤。

Loxodonta Africana is the largest living mammal in the land.

陆地上最大的哺乳动物，非洲象

I didn't watch TV last night, because it .

昨晚我没有看电视，因为电视机坏了。

Since this year, in a lot of villages of Beijing, TV of elevator liquid crystal was removed.

今年以来，在北京的很多小区里，电梯液晶电视被撤了下来。