生态学家主要关注的是流经某一生态系统的物质和能量的量以及它们的速度。
The ecologist is concerned primarily with the quantities of matter and energy that pass through a given ecosystem, and with the rates at which they do so.
女性面临压力的机会增多，导致体内压力化学物质分泌量增加。
Adding to a woman's increased dose of stress chemicals, are her increased "opportunities" for stress.
科学家最近发现，如果使用油包水型物质来强化免疫反应，生产大流行性流感疫苗所使用的抗原量就可以减少。
Scientists have recently discovered they can reduce the amount of antigen used to produce pandemic influenza vaccines by using water-in-oil substances that enhance the immune response.
保健品生产商出资成立的保健品信息服务部称：“这项研究没有提供任何证据证实复合维生素与乳腺癌相关。 鉴于英国女性对微量营养素的摄入量低，且我国饮食结构不够完善，服用复合维生素能极大帮助此类人群提高维生素和矿物质的摄入量。”
The Health Supplements Information Service, funded by supplements manufacturers, said: 'This does not provide any proof that multivitamins are linked to breast cancer.
事实上，对于预期妇女，某些维生素和矿物质的建议允许量是可以改变的，她们可以要求某些获得更多，或注意另一些的摄入量。
In fact, for expecting women, the recommended allowances of certain vitamins and minerals can change, women can be asked to get more of some, or watch their intake of others.
开普罗博士说，就算每个楼层的作物都能绕着窗户运行并获得均等的日光照射，作物得到的光照量还是很少的，只能制造出少量的生物质。
Even if each floor rotates its crops past the Windows so that all plants receive an equal amount of natural light, overall they would get less light, and so produce less biomass, says Dr Caplow.
低含氧量导致细菌滋长，这些细菌会破坏硝酸盐——海洋微生物及浮游植物的重要营养物质之一。
Low oxygen levels encourage the growth of bacteria that destroy nitrate - a vital nutrient for the ocean's microscopic plants, or phytoplankton.
然而，要到达26万亿英里之外的半人马座阿尔法星，携带和储存足够量的反物质难度极大，这种燃料不仅状态不稳定，而且耗资不菲。
However, getting enough antimatter for the 26 trillion-mile, one-way trip to Alpha Centauri and storing such a volatile fuel for long periods is prohibitively expensive and difficult.
在自然界中，一个气泡的寿命依赖于其所含可溶性有机质和纳米粒子的量，没有这些物质，气泡将迅速地缩减并消失。
In nature, a bubble's lifetime depends on the level of dissolved organic matter and nanoparticles, without which small bubbles rapidly shrink and disappear.
青少年可能是人群中最容易因为日常饮食中的蔬菜和水果摄入量不足而导致维生素及矿物质缺乏的群体。
Teenagers are probably the least likely among us to eat enough fruits and vegetables or to get adequate amounts of vitamins and minerals from their diet.
所以，大气含氧量由这些物质的深埋和掘出的平衡关系所决定。
So oxygen levels can go down as well as up, depending on the balance between burial and exhumation.
而且，英国的土壤，一方面酸雨把土壤中的矿物质过滤掉了，另一方面密集种植使得土壤中矿物质含有量达到历史以来最低点，几近枯竭。
Then there’s the state of our soils. Acid rain leaches minerals out of the soil while intensive farming has depleted levels to the lowest in recorded history.
对于恋人而言不幸的是，在试验中所使用的白藜芦醇的量等同于饮用这种物质的外包装。
Unfortunately for lovers, the quantities of resveratrol used in the study would equate to drinking ‘crates' of the stuff.
它的味道和气味都取决于生氰配糖物的量，这种物质是有剧毒的。
The taste, as well as the smell, all depends on the amount of cyanogenic glucosides, which are in fact, extremely poisonous.
在今天结束的时候，你们就可以知道这点，好，现在当我达到某一纯度的时候，这是我得到的物质的量。
So at the end of the day, you can figure out, OK, now when I reach a certain degree of purification, here's how much of the stuff I end up with.
例如，每天增加半克此种物质(一般在胡桃或芥花籽油里)的摄入量，都会降低百分之18患抑郁症的风险。
For every increase of half a gram in daily intake of the substance — common in walnuts and canola oil, for instance — there was an 18-percent reduction in the risk of depression.
你可以在色拉上放几片鳄梨，这样能提高维生素和矿物质的摄取量。
Top your salad with a few slices of avocado, and you'll be increasing your intake of vitamins and minerals from the meal.
确切影响将取决于放射性物质的性质和摄入量。
The exact effect will depend on the nature and the amount of radioactive material that have been ingested.
所以在最后会得到,一些纯净的物质，但不是所有的量。
So yes it'll be the little bit you've gotten at the end is going to be really pure, but there's not a whole lot of it.
不过，总会到一定时间母乳就已经不再满足到BB的需求，而不能提供婴儿的成长需要各种的营养物质的量。
However, there will be a time when the baby needs much more nutrients as they grow up and mother's milk can not accomplish it anymore.
研究人员估计致癌物质摄入量的基础上整体肉类消费和doneness偏好。
Researchers then estimated carcinogen intake based on overall meat consumption and doneness preferences.
仍然可以继续通过，共存曲线来，反复提纯B物质，挥发性低的物质，最后可以得到一点量。
You can continue to walk your way down through these coexistence curves and purify repeatedly the component B, the less volatile of them, and end up with some amount of it.
表面活性剂：在添加量很低的情况下也能显著降低界面张力的物质。
Surfactant: in addition amount of low also can significantly reduce the interfacial tension of the material.
本试验研究了大豆在不同密度和施氮量处理下，子粒中干物质、蛋白质和脂肪积累的动态变化。
Dry matter, Protein and oil accumulations in seeds of soybeans, under different density and nitrogen top-dressing treatments, were studied.
这就是说喝些矿泉水可以大量增加你的矿物质摄入量——每天喝一升的矿泉水可为身体提供每日所需钙元素的20%到58%，每日所需镁元素的16%——41%。
Which means drinking some can increase your intake tremendously-as in, one liter per day can cover 20 to 58 percent of your daily calcium requirements and 16 to 41 percent of your magnesium needs.
辣椒中含有辣椒素，这是一种可以提高静息时热量燃烧的化学物质，也能减少饥饿感和食物摄入量。
Hot peppers contain the active ingredient capsaicin, a chemical that can enhance calorie burning at rest as well as reduce hunger and food intake.
辣椒中含有辣椒素，这是一种可以提高静息时热量燃烧的化学物质，也能减少饥饿感和食物摄入量。
Hot peppers contain the active ingredient capsaicin, a chemical that can enhance calorie burning at rest as well as reduce hunger and food intake.
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