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英语解释:the existence of someone or something in a particular place
This will help to overcome problems of apparent bimodality caused by the presence of many below-detection-limit values in a data set.
Alkanes can be chlorinated or brominated by treatment with chlorine or bromine in the presence of visible or uv light.
Partly because I wished to forget her depressing presence I began to look at the evening paper.
Relatively few foresters or tree breeders consider the presence of edaphic ecotypes.
How empty is theory in presence of fact!
Recently the reactivity of nitric esters in the presence of hydrazine has been investigated.
She hated London now, and the flat, the room must be horribly bare without the joyous presence of Gerald.
The initial requirements involved the belief that the presence of a duplex or 'necklace' structure was intolerable from a low cycle fatigue aspect.
The presence of a nodular liver at the time of examination may be revealing.
The presence of a nonvolatile solute in a liquid always lowers the vapor pressure of the solution.
Some celestial bodies similar to galactic nebulas but without any luminosity sometimes reveal their presence as dark patches obscuring the light of stars beyond them.
Its presence was as familar in the state as sunshine, oranges and wine.
How queasy we become in the presence of anyone who supposes that he has charm when he really has none!