Radioactivity activity
[機] 放射性
?? 詞語組成解析
radioactivity
[,red?o?k't?v?ti]
n. 放射（性）;輻射能;
radio光線+act行動，做+ivity表示情況、狀態、“...性”、“...力” →放射性；[核] 放射能力；[核] 放射現象
??? 情景例句
He doesn't have any family with him.
他沒有家人和他在一起。
The increase in sales is being maintained.
銷售額持續增長。
He ate simply, and never ate meat. He rose early in the morning and worked at his wheel, making cotton thread.
他吃得很簡單，且從不吃肉。他每天早晨早早就起床，轉動紡車，紡棉紗。