chemical composition

基本解释

We know they smear a liquid on the tube, but we don’t know where they secrete it from or what its chemical composition is.
我们知道它们在往玻璃管上抹一种液体，但我们不知道它们是从哪里分泌出来的，也不知道它的化学成分。
It measured temperature, pressure, chemical composition, cloud characteristics, sunlight and energy internal to the planet, and lightning.
它测量温度，压力，化学成分，云的特点，阳光和行星内部的能量，以及闪电。
Some researchers think they have the answer, and it comes down to the structure of the food, not its chemical composition-a finding that could help rid some processed foods of chemical preservatives.
已有些研究者认为他们找到了答案,这与食物的结构有关,而不是它的化学成分—这一发现使得有些化学处理保存食物的方法无效了。

Now, the differences here may be subtle in terms of chemical composition or if you put these cells under a microscope and looked at their analysis.
干细胞与祖细胞化学成分的区别,还非常微小,除非你把细胞放在显微镜下,或者看细胞分析报告
耶鲁公开课 - 生物医学工程探索课程节选
In the time it takes for one cell division to occur, it could be that this cell entraps a different chemical composition of the cytoplasm then this entraps, and that's a well known concept.
当一个细胞分裂发生期间,很可能这个细胞截留了一种不同的,细胞质化学组分,这种非对称分裂是一个广为人知的概念
耶鲁公开课 - 生物医学工程探索课程节选
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

Rover scientists waited for data from rover instruments that measure the chemical composition of rocks.
NPR: Mars Rover Marks Second Anniversary of Landing

化学组分
The lignin is ,the main chemical composition of plants, the organic compound which quantity is only inferior to the cellulose on the Earth, the evolution product of the plant organization. Lignin plays a vital role in plant's normal growth.
木质素是植物体的主要化学组分,是地球上数量仅次于纤维素的有机物,是植物组织进化的产物,对植物的正常生长具有重要作用。
化学组成

结构
The effect of process parameters on the chemical composition and structure of titanium oxide films were studied.
研究了工艺参数对氧化钛薄膜的结构及成分的影响。
能源科学技术
成份