Ecosystems thus involve the circulation, transformation, and accumulation of energy and matter through the medium of living things and their activities.
因此，生态系统以生物及其活动作为媒介，涉及能量和物质的循环、转化和积累。
By use of rate equations, we have analyzed the effect ot laser wavelength radiation in pump light source on excited state population accumulation of laser medium and laser threshold.
本文用速率方程分析了泵浦光源中激光波长辐射对激光介质激发态粒子数积累和激光器阀值的影响情况。
Because of the continuous energy accumulation of stress concentration units, hardening process of medium emerges.
应力集中单元由于能量的不断积累，介质出现硬化过程。
Effects of medium components and culture conditions on cell growth as well as lipid accumulation of c.
研究了培养基组成及培养条件对其细胞生长和油脂积累的影响。
Statistics of gas in place, gas-bearing area and reservoiring period of over 60 large and medium gas fields in China show that their accumulation efficiencies vary greatly.
中国60余个大中型气田天然气地质储量、含气面积和成藏时期的统计结果表明，中国大中型气田的聚集效率差别很大。
On the other hand, amount and fashion of accumulation of glucose and fructose alter in fermentation culture medium containing 10% sucrose.
在10%蔗糖发酵培养基中，发酵液中葡萄糖和果糖的积累量和积累方式发生改变。
In upper of the medium, the element accumulation of n, Ca, Mg, cu, Fe and Mn may be harmful to the plant.
试验显示营养液中的氮和钙、镁、铜、铁、锰等元素在基质上部富集，可产生肥料盐害。
Its dynamic model takes the influences of heat accumulation of medium and tube metal into consideration.
其动态特性计算考虑了工质及管壁金属蓄热的影响。
Huahai sag is a small sedimentary fault-depression basin formed during Mesozoic-Cenozoic periods, its accumulation conditions of oil and gas represent the characteristics of medium-small basins.
花海凹陷是一个小型的中新生代沉积断陷，其油气成藏条件在中小型盆地中具有代表性。
Parenchymal and venous changes (20%) included an increased or irregular accumulation of contrast medium, obstruction or stasis of vein (1.8%).
实质和静脉改变(20%)：实质期胰腺轮廓内的对比剂浓度降低或不规则加深；静脉阻塞、血流淤滞(1.8%)。
Studies have showed that dry matter accumulation of cotton were short and slow in the growth of perhaps, it increased fast in the medium-term and slowly increased in the latter.
研究表明，棉花干物质积累量前期积累少且慢、中期增多且加快、后期缓慢增加的趋势。
The results of accumulative toxicity experiment show that: the accumulation coefficient of ivermectin in mice is 4.53, which indicate that ivermectin is a medium accumulation drug.
蓄积性毒性试验结果表明：伊维菌素对小鼠的蓄积系数是4.53，属于中度蓄积药物。
The results of accumulative toxicity experiment show that: the accumulation coefficient of ivermectin in mice is 4.53, which indicate that ivermectin is a medium accumulation drug.
蓄积性毒性试验结果表明：伊维菌素对小鼠的蓄积系数是4.53，属于中度蓄积药物。
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