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英语解释:existing in nature and not produced or caused by people; not changed from a natural state by production or growing methods
英语解释:someone whose skills and abilities suit a particular job or activity
One of the three is a natural for you.
Forest ecologists have been more concerned than agronomists with the inner mechanisms of natural and artificial ecosystems.
.the reformer's apocalyptic warnings that the nation was running out of natural resources.
Instead of resenting or answering the simple but natural appeal of Hist, he walked away.
They felt it might be a being partially benighted in the vale of ignorance, but it could not be one who would willingly devote his rich natural gifts to the purposes of wanton treachery.
Accumulation of toxic substances in the biosphere is causing serious changes in the structure and function of natural ecosystems.
The world's natural ecosystems act as a buffer.
Two of history's worst natural catastrophes occurred in 1970.
Alpha particles are positively charged helium nuclei obtained from natural radioactive decay.
The natural logarithm of this ratio is called the logarithmic decrement.
Instead, they have formed deposits of coal, natural gas and oil, often located far beneath the land surface or the sea-bed.
Diligence combined with natural ability earned him commendations from superiors.
It offers an alternative to the dwindling supplies of natural gas.
The economic system of any nation is the mechanism which brings together natural resources, the labor supply technology, and the necessary entrepreneurial and managerial talents.
I am convinced that natural selection has been the main but not the exclusive means of modification.
They concluded that ozone attack on natural rubber was extensive and complex and could be related to the acetone extractables.
The intensification of the immunological response represents the body's natural defence.
All these statements are now known to be inconsistent with careful observation of natural phenomena.
Elasticity, solubility, inflammability are paradigm cases of dispositions in natural objects.
It is not a natural thing for a boy to envy his father in this fashion without some inspiration.
Conservation laws, being based on the most elementary and intuitive ideas, are the most profound statements of natural law.
Another result of the philosophy of natural law was a strong movement for legislation.
Reliance upon natural epidemics may be both time-consuming and misleading.
Kennedy had a natural curiosity about Khrushchev.
We uncover the defects of natural laws, and see the quandary that man is in by their operation.
The Irish, by a natural reaction, rallied about the persecuted Catholic church.
His natural reserve made him appear self-conscious.
Many believe artificial soils do not simulate natural soils.