准周期

数学英语 23 What are the Range and Standard Deviation?

by Jason Marshall Weve now talked about three methods for calculating average values: the mean, median, and mode (affectionately known as the three Ms). So, are we done? Is that everything we could ever want to know about interpreting average values?

发表于:2018-12-07 / 阅读(72) / 评论(0)

数学英语

英语语法：127 How Many Spaces After A Period?

Grammar Girl here. This week I have two topics for you: The number of spaces after a period at the end of a sentence, and whether you should use who or that to refer to people (and pets). Now here's our first listener question. His friends believe it

发表于:2019-01-02 / 阅读(52) / 评论(0)

英语语法 Grammar Girl

SSS 2011-10-05

This is Scientific American's 60-Second Science. I'm Steve Mirsky. Got a minute? The 2011 Nobel Prize in chemistry goes to Daniel Schechtman of the TechnionIsrael Institute of Technology in Haifa. Schechtman discovered what are called quasicrystals.

发表于:2019-01-08 / 阅读(72) / 评论(0)

Scientific American(十)月

租房英语：Grace period 宽限期

很多打算赴国外留学的同学现在已经在联系租房的事了，在国外租房的时候一定要签订正式的租约(lease)或住房合同(housing contract)，这有时候也被称为租房协议(rental agreement)。租房合同里大家要

发表于:2019-02-02 / 阅读(54) / 评论(0)

实用英语

2.85 bln road journeys over festival period

BEIJING, Feb. 16 (Xinhua) -- The Ministry of Transport (MOT) said Thursday that about 2.85 billion passenger-trips by roads were made during the 40-day Spring Festival travel rush this year, up 9.6 percent from the corresponding period last year. A t

发表于:2019-02-07 / 阅读(150) / 评论(0)

英语新闻

学个词 Learn a Word-VOA英语教学 2058 grace period

今天我们要学的词是 grace period. Grace period 宽限期。日本通过立法，禁止持有儿童色情的图片和视频。The new law allows a grace period of one year for owners of such materials to get rid of them. 新法给现已持有这

发表于:2019-02-16 / 阅读(56) / 评论(0)

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学英语单词

a bag of game

acute progressive myositis

adherent leucoma of cornea

air-turbulence interferometer