物质英语怎么说
How? Air filters can also act as a magnifier, forcing air into the combustion chamber while performing their job of blocking out harmful matter.
Now a team at the United Arab Emirates University have worked out a way of modifying the chemicals to remove their harmful side-effects.
Keep paints, used oil, cleaning solvents, pool chemicals, and other dangerous household chemicals out of drains, sinks, and toilets because many of these products contain harmful substances.
Filters contained in sunscreen that keep out ultraviolet (UV) radiation can generate harmful compounds that attack skin cells, says a new study.
The placenta also filters out many harmful substances that may be in the mother's bloodstream and could damage the fetus.
But when we analyze these cells chemically, we find something very interesting, a chemical in them, an enzyme called telomerase.
Debris thrown into the atmosphere by an asteroid collision would presumably contain large amounts of iridium, and atmospheric currents would carry this material all over the globe.
With so much stuff in space, and a limited area around our planet, the government wants to reduce the chances of a collision.
The bond coincided with a huge release of the feelgood chemical dopamine inside their brains.
And the effects of exposure to the widespread chemicals may add up.
In general, pull factors add up to an apparently better chance for a good life and material well-being than is offered by the place of origin.
So we suppose that there is something that is common to these.
Forslan's object is to gather as great a diversity of genetic material as possible.
Propolis is a hard resinous substance made by bees from the juices of plants.
Scientists transmuted matter into pure energy and exploded the first atomic bomb.
During the 1980s the U.S. became a very materialistic society.
Natural philosophy involved the study of all aspects of the material world, animate and inanimate.
To explain this, they hypothesize that galaxies must contain a great deal of missing matter which cannot be detected.
Tests have shown high levels of pollutants in the water.
The levels of chemicals in the river are not insignificant.
The minerals in the water made it unpleasant to drink.
Materially they are no better off.
Perfume interacts with the skin's natural chemicals.
Plants draw minerals and other nutrients from the soil.
The wine had been doctored.