Two types of substitute valves are available: a mechanical valve or a biological valve.

Objective : To investigate the storage stability and biological properties of the new chitosan burn dressing.

目的: 检测新型壳聚糖烧伤敷料的储存稳定性,并进行生物学评价.

There is a widespread testimony that this ominous fact is due to inherent biological defects in the crowded life of cities.

有一个普遍的证据可以说明这种不吉利的事实归咎于城市拥挤生活中的固有的生态缺陷.

Eugenics has a biological significance.

优生学具有生物学上的意义.

In biological terminology life is divided into two groups: plants and animals.

在生物学术语中,生物分为两大类: 植物和动物.

It is a question of interest to biological science.

这是生物学长期以来感兴趣的问题.

This is a natural biological response.

这是自然的生物反应。

Most young women feel a biological need to procreate.

大多数的年轻妇女都有生儿育女的生理需要。

The living organisms somehow concentrated the minerals by biological processes.

生命体通过某种生物过程聚集矿物质。

Such a war could result in the use of chemical and biological weapons.

这样的战争可能导致使用生化武器。

the biological effects of radiation

辐射对生物体的影响

Unfortunately a woman's biological clock is no joke.

不幸的是,女性的受孕生理钟可不是闹着玩的.

A ticking biological clock was a factor for only 21 percent of women.

只有21%的女性认为滴答不停的生物钟是考虑何时要孩子的因素之一.

Bear in mind that you'll have to take your biological clock into account.

记住,必须考虑到自己的生物钟.

Natural light helps to regulate your biological clock, so exercise outdoors if you can.

自然光有助于调节你的生物钟, 所以如果可能的话,到户外去运动.

Does the person's food have biological clock after character?

人的饮食到底有没有生物钟可言?

Insects possess a biological clock that programmes the insect's growth, reproduction and dormant periods.

昆虫具有一种生物钟,它会按照遗传密码控制昆虫的生长 、 繁殖和休眠期.

Every living thing has what scientists call a biological clock that controls behavior.

每一种生物都有控制自己行为的时钟,科学家们称之为生物钟.

Study on function and mechanism of biological clock was one of time _ biology frontiers.

调节哺乳动物生物钟的光感受器是目前生物学研究的热点之一.

This paper reviews the signal transduction pathways regulated by light in the biological clock.

本文综述了光信号对高等植物生物钟的调节作用和转导途径.

And activating it at the same time every morning synchronizes your body's biological clock.

每天早晨在同一时刻激活大脑就校对了人的生物钟.