绝对没有确保香烟不含有毒物质的规定。
There's absolutely no regulation of cigarettes to make sure that they don't include poisonous substances.
然而，购买这些物质的满足感很快就消失了。
Yet satisfaction with these material purchases wears off fairly quickly.
在20世纪70年代，有一些试图改善物质的措施。
Through the 1970s, a number of measures sought to improve matter.
属于这类物质的有云母、瓷器、石英、玻璃、木材等等。
To this class of substance belong mica, porcelain, quartz, glass, wood, etc.
当岩浆撞击岩层时，会出现岩屑，形成液态和固态物质的混合物。
As the magma smashes through layers of rock, it rips out debris, creating a mix of liquid and solid material.
玉米淀粉和少量水混合后产生的粘稠物质就是这种物质的常见例子。
The gooey substance produced by mixing cornstarch with a little water is a commonplace example of such material.
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。
Ecosystems thus involve the circulation, transformation, and accumulation of energy and matter through the medium of living things and their activities.
尽管它的视觉效果如此显著，但尘埃只是位于恒星之间的物质的一个次要组成部分，其密度极低。
Although its visual effect is so pronounced, dust is only a minor constituent of the material, extremely low in density, that lies between the stars.
当我们防止物质的浪费、提高能源效率或提高资源生产率时，我们就节约了资金、提高了盈利能力并增强了竞争力。
When we prevent physical waste, increase energy efficiency or improve resource productivity, we save money, improve profitability and enhance competitiveness.
质子是带正电荷的物质的基本粒子。
A proton is an elementary particle of matter that possesses a positive charge.
测试显示水中污染物质的含量很高。
防护手套可以减少皮肤对化学物质的吸收。
Protective gloves reduce the absorption of chemicals through the skin.
在她第一本书中，她解释了植物纤维、维生素、矿物质和其他重要营养物质的作用。
In her first book she explained the role of vegetable fibres, vitamins, minerals, and other essential nutrients.
有害垃圾包括灯、电池及其他含有有害化学物质的物品。
Harmful garbage includes lamps, batteries, and other things with harmful chemicals.
该组织对有害化学物质的排放制定了严格的规定。
The organization has set strict rules on the release of harmful chemicals.
在制作牛仔裤的过程中，牛仔布要经过多种人造化学物质的处理。
In the process of making jeans, denim is treated with many types of man-made chemicals.
化学过程是指化学物质聚集在一起产生其他化学物质，进而产生其他物质的过程。
A chemical process is what happens when chemicals come together to make other chemicals, and therefore other things.
研究人员最新发现，增加这种化学物质的释放大大增加了动物的好奇心。
Researchers newly found that increasing the release of the chemical greatly increased the curiosity in animals.
其中包括叶子上载有传感器的植物，能显示出它们何时缺水，还包括一种可以检测到地下水中有害化学物质的植物。
These include plants that have sensors printed onto their leaves to show when they're short of water and a plant that can detect harmful chemicals in groundwater.
“奖励不一定是物质的东西。”科内蒂说。
化学物质的蒸发对它们的生存是必不可少的。
The evaporation of chemicals is necessary for their survival.
地球上的大部分成分以熔化或汽化物质的形式存在。
Most of the earthly component would have been in the form of melted or vaporized matter.
农舍里的电脑正在检查温度、水和土壤中有机物质的含量。
The computer in the farmhouse is checking the temperature, the water and the level of organic material in the soil.
只有拥有球形膨胀物质的星系才可能容纳超大质量的黑洞。
Only galaxies with a spherical bulge—like component appear to accommodate supermassive black holes.
我们可以根据物质的特性把一种物质与另一种物质辨别开来。
We can distinguish one kind of substance from another by its properties.
保健食品是指具有特定保健功能或补充维生素或矿物质的食品。
Health food refers to food products which claim to have specific health functions or supplement one's vitamins or minerals.
这意味着地幔中的气体不是来自太阳，而是来自岩石物质的早期积累。
The implication is that the gases in the mantle came not from the sun but from the early accretion of rocky material.
看来，板块上侧冷却的地幔物质的下沉流可能是造成这种深盆地的原因。
It seems possible that a sinking current of cooled mantle material on the upper side of the plate might be the cause of such deep basins.
BBC新闻指出，人体会受到能产生“幸福感”的天然化学物质的影响。
The human body is influenced by natural chemicals that produce "a sense of happiness", noted BBC News.
BBC新闻指出，人体会受到能产生“幸福感”的天然化学物质的影响。
The human body is influenced by natural chemicals that produce "a sense of happiness", noted BBC News.
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