| 单词 | bell jar |
| 释义 | bell jar noun[C] uk/ˈbel ˌdʒɑːr/us/ˈbel ˌdʒɑːr/alargeglasscovershapedlike abellused tocoverchemicalequipment,especiallytopreventanygasfromescaping 钟形罩 AlexLMX/iStock/Getty Images Plus/GettyImages Laboratory equipment
Examplesofbell jarbell jar Bell jars are generally used for classroom demonstrations or by hobbyists, when only a relatively low-quality vacuum is required. From Wikipedia  This example is from Wikipedia and may be reused under a CC BY-SA license.Although internationally connected, each country's elite lives in abelljarin the sense of being out of touch with its own populace. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license.By pumping the air out of thebelljar, vacuum is formed. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license.She describes her depression as a feeling of being trapped under abelljar, struggling for breath. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license.As the family laugh together, it is revealed that they are models inside abelljaron the street stall seen earlier. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license.He portrayed the device as abelljarwith an opening for the air to enter from below. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license.For this reason, abelljarcan not be used to contain pressures "above" atmospheric, only below. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license.Abelljardemonstrates the reason for using a rocket instead of a propeller in the vacuum of space. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license.An example of a classroom science experiment involving abelljaris to place a ringing alarm clock under thebelljar. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license.Abelljaris placed on a base which is vented to a hose fitting that can be connected via a hose to a vacuum pump. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license.As the air is pumped out of the sealedbelljar, the noise of the alarm clock fades, thus demonstrating that the propagation of sound is mediated by the air. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license.They also were expensive compared with traditional gardeners' bell jars and cloches. From theCambridge English Corpus More often, a cloche, orbelljar, refers to a covering made of glass or plastic, placed over individual plants to provide similar protection as row cover. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license.The table is covered with scarlet velvet, many papers, a casket, an inkwell with two more feather pens, a barometer, a gasometer, a water still and a glassbelljar. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license.His name apparently refers to bell jars. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license.These examples are from corpora and from sources on the web. Any opinions in the examples do not represent the opinion of the Cambridge Dictionary editors or of Cambridge University Press or its licensors. |
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