Half-life
n. 半衰期, 半排出期\\n[化] 半衰期; 半壽期
?? 牛津釋義
half-life
n time taken for the radioactivity of a substanceto fall to half its original value 半衰期（某物質的放射性元素由原有量衰減到一半所需的時間）.
?? 詞語組成解析
half
[h?f]
adj. 一半的，半個的;
n. 半;一半;（啤酒等飲料的）半品脫;（比賽、音樂會等的）半場;
adv. 一半;部份地;
life
[la?f]
n. 生活，生計;生命，性命;一生，壽命;人生，塵世;
??? 情景例句
The world's greatest grandmother, Mrs. Ellen Stewart,
世界上最偉大的祖母， Ellen Stewart太太，
Would you mind calling back sometime tomorrow?
你介意明天某時打電話回來嗎？
In another game, as the turtle swims across the oceanarium, the first porpoise swoops down from above and butts his shell with his belly.
在另一場游戲中，當海龜游過水族館時，第一只海豚從上方猛撲下去，用腹部撞擊龜殼。