The National Association for Sport and Physical Education says twenty to thirty students in a P.E.class should be the limit.
VOA : special.2009.08.06
Submitted by e-mail by 5 p.m.
东部标准时间下午五点前通过电子邮件提交。
固态化学导论课程节选 : 麻省理工公开课
We can go all the way down -- magnesium aluminum, all the way to this noble gas, 3s23p6 argon, which would be n e and then 3 s 2, 3 p 6.
我们可以继续,镁,铝,一直到惰性气体,氩它是Ne然后。
化学原理课程节选 : 麻省理工公开课
A list of American colleges and universities that offer financial aid to foreign students can be found at edupass.org -- e-d-u-p-a-s-s dot o-r-g.
VOA : special.2009.02.05
Gregg Easterbrook writes a weekly piece called "Tuesday Morning Quarterback" for E.S.P.N.com.
VOA : special.2010.02.05
英汉双解词典包含3185865条英汉词条,基本涵盖了全部常用单词的翻译及用法,是英语学习的有利工具。