单词：frequencies
n the ratio of the number of observations in a statistical category to the total number of observations
n the number of observations in a given statistical category
frequencies的用法和样例：
例句
- At some frequencies, it can penetrate walls.在一些频率，它能穿透墙壁。
- Confined waves have definite frequencies.被限制的波具有确定的频率。
单词：frequencies 相关文章
JOHN ZARRELLA, CNN CORRESPONDENT: For 18 hours, Romel Joseph lay buried in the rubble of his music school in Port-au-Prince. For 18 hours until his rescue, the concert violinist stayed alert and alive going over in his head, one by one, every concert
CNN2010年(二)月
Im glad Raymond isnt the thief, said Violet. Or Danny Duellman. Jessie agreed. And its nice that theyre both helping out the Greenfield Four. The girls were at the rehearsal studio unpacking bags of sandwiches. Henry was opening up the soda, and Benn
109 The Rock N Roll Mystery
Online gamers enjoy a concert on the BBC's virtual island The line between the real world and online virtual worlds is becoming increasingly blurred with gamers spending real money to buy virtual commodities and even real estate in digital worlds. W
Take Away English
By Jerilyn Watson Broadcast: October 30, 2003 This is Steve Ember with the VOA Special English Education Report. Many people remember the day in school when they had to 1)cut up a dead frog. Students
VOA2003（下）-教育与新闻
Leslie: This keyboard is so hard to use. I cant find where anything is! Dave: Its a standard QWERTY keyboard. The layout may be a little different, with the function keys on the right-hand side instead of on the top, but youll get used to it in no ti
地道美语播客
The tech world is buzzing over Apple's latest must-have gadget, the MacBook Wheel, a revolutionary new laptop that does away with the keyboard. Tech Trends reporter, Jeff Tate has more. Thanks, Andrea. Say goodbye to the keyboard and hello to the fut
英语杂谈