Homeostasis is the state of maintaining a constant composition of blood.

平衡是保持血液中成分稳定的状态。

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The constant composition method was used to study the kinetics of demineralization on dentine crystal, hydroxylapatite and tooth enamel.

应用等组分晶体生长方法 ，研究了牙本质晶、羟基磷灰石、釉质晶脱矿动力学。

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Compared with infant milk powder, ready-to-feed infant milk has many advantages, such as no need to dilute, constant composition, east to use, safe and hygienic, and so on.

与婴儿奶粉相比，液态婴儿奶具有很多优点，如勿需冲调、浓度恒定、喂食方便、安全卫生等。

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Well that process of control to maintain a constant environment inside our body, whether it's an environment of constant mass or constant composition, or constant temperature, is called homeostasis.

这个控制过程维持着,体内环境的恒定,不论是内环境中物质的量的稳定,或者成分的稳定,或温度的稳定,这种状态叫做内稳态

耶鲁公开课 - 生物医学工程探索课程节选

Because any velocity I ascribe to a particle or an object, you will add a certain constant to it by the law of composition of velocity.

因为我描述的任何一个质点或者物体的速度,你都要根据速度叠加法则,给它加上某个常数

耶鲁公开课 - 基础物理课程节选

We need to have conditions internally that are relatively constant in terms of temperature, and pH, and chemical composition in order for us to thrive.

我们需要体内的环境参数保持相对稳定,这些环境参数包括,温度,pH值,以及化学组成,这样人才能茁壮成长

耶鲁公开课 - 生物医学工程探索课程节选

The expectation is that the Fed, weary of jumping the gun on QE3, will instead shift the composition of its massive portfolio, keeping size constant.

FORBES: After ECB And G7 Commit To Intervene Markets, Will Bernanke Enact QE3?