half-life 的定义
plural half-lives [haf-lahyvz, hahf-]. /ˈhæfˌlaɪvz, ˈhɑf-/.
- Physics. the time required for one half the atoms of a given amount of a radioactive substance to disintegrate.
- Also called biological half-life .Pharmacology. the time required for the activity of a substance taken into the body to lose one half its initial effectiveness.
- Informal. a brief period during which something flourishes before dying out.
更多half-life例句
- Eric Garcetti succeeded Villaraigosa and has received high marks in his first year and a half on the job.
- His life as a man is built around health insurance and tax services.
- It was also an attack on our freedom of expression and way of life.
- I always wanted my life to be that way, and it became that way.
- My dad was a sailor, and all through my childhood he was away half of the time at sea, and to an extent I have a similar job.
- It is the principal waste-product of metabolism, and constitutes about one-half of all the solids excreted—about 30 gm.
- A small book, bound in full purple calf, lay half hidden in a nest of fine tissue paper on the dressing-table.
- Now, it immediately occurred to Davy that he had never in his whole life had all the plums he wanted at any one time.
- Hilda, trembling at the door, more than half expected Mr. Orgreave to say: "You mean, she's invited herself."
- Dean Swift was indeed a misanthrope by theory, however he may have made exception to private life.