Filter

(noun.) device that removes something from whatever passes through it.

(noun.) an electrical device that alters the frequency spectrum of signals passing through it.

(verb.) remove by passing through a filter; 'filter out the impurities'.

编辑:西尔维亚

• To every gallon of juice to be filtered there is placed in the filter 2 ounces of charcoal, 2 scruples of crushed mustard seed, and 6 drachms of ground sassafras root. 威廉K.戴维. 智者、化学家和伟大医生的秘密.
• Cut the camomile in pieces and rub fine with the sal-ammoniac; add the lavender water and vinegar by placing all in a glass flask and let it digest for twelve hours and filter. 威廉K.戴维. 智者、化学家和伟大医生的秘密.
• The reason why those little preliminary explosions took place was that a little had spattered out on the edge of the filter paper, and had dried first and exploded. 弗兰克·刘易斯·戴尔. 爱迪生的生平和发明.
• Let stand for a few days and filter through a felt bag or filtering paper. 威廉K.戴维. 智者、化学家和伟大医生的秘密.
• The same form of tube answers equally well for keeping a constant level in a filter or drying chamber. 威廉K.戴维. 智者、化学家和伟大医生的秘密.
• After concentration the crystallized sugar is separated from the syrup by a centrifugal filter, in which the liquid is thrown from the crystallized sugar by centrifugal action. Edward W. Byrn. 十九世纪发明进展.
• Then add the mercurial solution, filter, and make up the whole to the measure of one imperial pint (20 ounces) with more orange-flower water. 威廉K.戴维. 智者、化学家和伟大医生的秘密.
• Practically all household filters of drinking water are made of charcoal. 伯莎M.克拉克. 科学通论.
• Pure siliceous sands are very valuable for the manufacture of glass, for making mortar, filters, ameliorating dense clay soils, for making molds in founding and for many other purposes. 佚名. 神奇的知识之书.
• The foul, bad-smelling gases which arise from sewers can be prevented from escaping and passing to streets and buildings by placing charcoal filters at the sewer exits. 伯莎M.克拉克. 科学通论.
• In like manner the yellow and blue plates are made by the use of appropriate color filters, each of which acts for its required color as that used for the red. 佚名. 神奇的知识之书.
• The Alberger system of salt manufacture is a mechanical process which subjects the salt brine to a much higher temperature and removes the impurities by means of mechanical filters. 佚名. 神奇的知识之书.
• The nose is provided with small hairs and a moist inner membrane which serve as filters in removing solid particles from the air, and in thus purifying it before its entrance into the lungs. 伯莎M.克拉克. 科学通论.
• The filtration plants owned and operated by large cities are usually safe; there is careful supervision of the filters, and frequent and effective cleanings are made. 伯莎M.克拉克. 科学通论.
• To every gallon of juice to be filtered there is placed in the filter 2 ounces of charcoal, 2 scruples of crushed mustard seed, and 6 drachms of ground sassafras root. 威廉K.戴维. 智者、化学家和伟大医生的秘密.
• In some cities where the water is very hard, as in Columbus, Ohio, it is softened and filtered at public expense, before it leaves the reservoirs. 伯莎M.克拉克. 科学通论.
• But is has filtered through into elementary education and largely controls its processes and aims. 约翰·杜威. 民主与教育.
• This was left on the meat for eighteen hours, and then filtered off through muslin. 威廉K.戴维. 智者、化学家和伟大医生的秘密.
• The latter is then filtered through bone black until it is colorless and is then evaporated in the vacuum pan, which is the important invention of the century in sugar making. Edward W. Byrn. 十九世纪发明进展.
• The lines _b_ show the relative number of people who died of typhoid fever before the water was filtered; the lines _a_ show the numbers who died after the water was filtered. 伯莎M.克拉克. 科学通论.
• All the water which reaches the well pipes will have filtered through the soil bed and therefore will probably be safe. 伯莎M.克拉克. 科学通论.
• This is done by attaching to the service pipe tanks filled with filtering material, through which the water flows before reaching the boiler. 威廉·亨利·杜利特. 世纪发明.
• After filtering it is again boiled, and if any scum or impurities appear on the surface they are removed, when the juice is to be bottled, corked tightly, and should be left for one year. 威廉K.戴维. 智者、化学家和伟大医生的秘密.
• Let stand for a few days and filter through a felt bag or filtering paper. 威廉K.戴维. 智者、化学家和伟大医生的秘密.
• Laboratory processes like distilling, filtering, crystallization, sublimation, became known to the Europeans through them. 李贝. 西洋科学史.
• This is accomplished by a central pumping and filtering plant and the return of the oil from all parts of the works by gravity. 弗兰克·刘易斯·戴尔. 爱迪生的生平和发明.

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