圆柱形钻头;套料钻

一杯好茶 A Nice Cup of Tea

If you look up 'tea' in the first cookery book that comes to hand you will probably find that it is unmentioned; or at most you will find a few lines of sketchy instructions which give no ruling on several of the most important points. This is curiou

发表于:2018-11-29 / 阅读(126) / 评论(0)

阅读空间

TED演讲:如何把熟蛋变生(2)

Here's the key part. 接下来是关键的部分。 The solution nearest the wall spins faster than the solution closer to the middle. 离试管壁最近的溶液，要比中间的溶液旋转得更快。 That difference in velocity creates sheer str

发表于:2018-12-18 / 阅读(40) / 评论(0)

TED演讲教育篇

Dentist's Drill

Alice: Hello, I'm Alice Stephen: And I'm Stephen.Alice: And this is 6 Minute English! This week were talking about a very commonphobia a fear of the dentist and a possible new treatment. But first of all,Stephen, how does this sound make you feel? In

发表于:2019-01-07 / 阅读(113) / 评论(0)

六分钟英语

基因真能开启智慧之门么？

许多人都希望自己能变成更聪明。这也是各种健脑、补脑药品和营养品大行其道的原因。普林斯顿的一位神经生物学家Joseph Z. Tsien则宣称找到了开启智慧之门的钥匙基因。 Many people dream of hav

发表于:2019-01-17 / 阅读(44) / 评论(0)

英语美文

Iran wraps up missile drill, warns against military aggression on country

TEHRAN, July 4 (Xinhua) -- The Iranian Islamic Revolution Guards Corps (IRGC) concluded the three-day missile drill on Wednesday with Iranian military officials warning against any military aggression on the country. On the third and last day of the

发表于:2019-02-17 / 阅读(63) / 评论(0)

英语新闻

Beijing police run drill ahead of political sessions

BEIJING, Feb. 24 (Xinhua) -- Police in Beijing municipality have performed an emergency response drill in their preparations for the country's annual legislative and political advisory sessions, a police officer said Friday. The drill was organized t

发表于:2019-02-17 / 阅读(53) / 评论(0)

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approximation to the true mode