Infra acoustic frequency
[電] 低聲頻
?? 詞語組成解析
adv. 在下, 以后\\n[法] 在下, 以下
acoustic
[?'ku:stik]
adj. 聽覺的;聲學的;原聲的;音響的;
frequency
['frikw?nsi]
n. 頻繁性;[數][物]頻率，次數;頻率分布;
fr + equ =equal,even,表示“相等，平均” + enc + y [形容詞后綴] → n.屢次；次數；頻率
??? 情景例句
That figures!
那有道理。
What have you decided?
你決定了什么？
Libraries made education possible, and education in its turn added to libraries: the growth of knowledge followed a kind of compound interest law, which was greatly enhanced by the invention of printing.
藏書使教育成為可能，而教育反過來又豐富了藏書，因為知識的增長遵循著一種“滾雪球”的規律。印刷術的發明又大大提高了知識增長的速度。