un. 高压蒸汽管线

Cooking Under Pressure When you boil potatoes on the stove top, it can take half an hour to cook them til tender. But, when you boil them in a pressure cooker, instead presto, theyre ready in about five minutes. Whats the difference? What makes press

发表于:2018-12-31 / 阅读(35) / 评论(0) 分类 英语听力文摘 English Digest

The United States has partnered with the United Nations Foundation's Girl Up campaign, Intel Corporation, Google, and other partners to lead the third annual Women in Science Girls STEAM Camp, to enable to girls to study the science, technology, engi

发表于:2019-01-03 / 阅读(95) / 评论(0) 分类 VOA标准英语2017年(8月)

A workboat pulls boom into place alongside the Pacific Responder oil skimming vessel in the Gulf of Mexico near the coast of Louisiana, 14 Jul 2010 BP has restarted a pressure test on a leaking oil well in the Gulf of Mexico to prepare for an effort

发表于:2019-01-13 / 阅读(45) / 评论(0) 分类 VOA标准英语2010年(七)月

By Melinda Smith Washington 12 September 2007 A recent study indicates that a disturbing number of American children with high blood pressure go undiagnosed. The study has prompted discussion worldwide about whether hypertension among children is jus

发表于:2019-02-03 / 阅读(103) / 评论(0) 分类 2007年VOA标准英语(九月)

There would soon be an explosion; the kettle would be burst open. It is in this way that boiler explosions are often caused. When there is too much steam in a boiler, and it cannot get out, it presses against the sides of the boiler, until at last th

发表于:2019-02-07 / 阅读(81) / 评论(0) 分类 英国学生科学读本

Boiling Water Under Boiling Clouds You may be surprised to hear that its actually easier to boil water on stormy days than it is when the weather is clear and sunny. Can you guess why? The reason is that the boiling point of water changes slightly in

发表于:2019-02-24 / 阅读(45) / 评论(0) 分类 英语听力文摘 English Digest
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