| 词汇 | half-life |
| 释义 | half-lifeWord family adjectivehalfenhalf-arsedhalf-bakedhalf-cuthalf-heartedhalf-hourlyhalf-timberedhalfwittedhalf-yearlyadverbhalfendealehalflingshalf-masthalfwaynounhalflinhalfbackhalfbeakhalf boardhalf-breedhalf-brotherhalf-castehalf-holidayhalf-hourhalf-lengthhalf-lifehalf-lighthalfpennyhalfpennyworthhalf-sisterhalf stephalf-termhalf-timehalf-truthhalfway househalfwithalf Physics ˈhalf-life noun [countableC] HPthe length of time it takes a radioactive substance to lose half of its radioactivity 〔放射性物质的〕半衰期 Examples from the Corpus half-life• The time it takes for a dose of a drug to wear off is measured by a value called a half-life.• But it has a half-life of just 140 days so there can be little delay manufacture and its incorporation into a bomb.• With a half-life of 12 years, tritium could build up in the Tamar estuary and eventually enter the human food chain.• The more complete descriptive term is drug elimination half-life.• The time taken for half of the atoms of a radioactive isotope to decay is called its half-life.• No one has a long half-life as the star of the program.• These effects are less marked with fentanyl because of its shorter serum half-life.• The daily intake should be divided into at least three doses because of the short half-life. |
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