Radioactive half-life
[化] 放射性半衰期
?? 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
Uh, are you going to be busy this evening?
今晚忙嗎？
I worked at the restaurant this morning.
我今早在餐廳工作。
We had to queue for hours to get in and there must have been several hundred people present just before the show began.
我們不得不排了好幾個小時才進得場去。在演出開始前場內肯定已有好幾百人了。