【生物工程学】滴流式过滤器[亦作 trickling filter]

掌握英语发音第一章第三节

[00:00.00][s],[ ][ ] [00:38.61]sea/sheet/chicken [00:42.66]Exercise One: Word Conparison [00:47.62]Listen to the following words from your tape and repeat. [00:52.98]sip ship sane shane watched washed [01:01.23]lass lash least leashed chin [01:09.09]

发表于:2018-12-03 / 阅读(127) / 评论(0)

掌握英语发音

365个英语简短小故事-335. The Vacuum Cleaner Filter(2)

But the HEPA filter for Olivers Vibe got dirty very quickly. And, it was not cleanableit was simply replaceable. When it turned filthy brown, Oliver went back to Target to buy a new filter. Oddly, Target sold the F15 belt for the Vibe, but not the fi

发表于:2018-12-11 / 阅读(70) / 评论(0)

365个英语简短小故事

DEVELOPMENT REPORT - Trickle Up Program Helps the Poorest of

DEVELOPMENT REPORT - Trickle Up Program Helps the Poorest of the Poor By Gary Garriott Broadcast: Monday, November 22, 2004 I'm Gwen Outen with the VOA Special English Development Report. There is an

发表于:2019-01-02 / 阅读(46) / 评论(0)

农业与发展

Indian Scientists Invent Nose Filter to Protect Against Air Pollution

From VOA Learning English, this is the Health Lifestyle report. In parts of India, it is not uncommon to see people wearing a mask over their nose and mouth. The capital, New Delhi, has some of the world's dirtiest air. The pollution was a call for a

发表于:2019-01-03 / 阅读(65) / 评论(0)

2018年VOA慢速英语(一)月

2007年VOA标准英语-Water Filter Wins Developer Engineering Prize

By Tabinda Naeem Washington, D.C. 21 May 2007 Two years ago, the National Academy of Engineering established the Grainger Challenge Prize for Sustainability. This $1 million award was designed to challenge the world's scientists to develop a practica

发表于:2019-02-03 / 阅读(92) / 评论(0)

2007年VOA标准英语（五月）

VOA常速英语2008年-Peacekeeping Troops Trickle Into Darfur

By Sabina Castelfranco Khartoum 14 March 2008 Egyptian troops will begin arriving in Darfur in the next few days as the combined U.N. / African Union Peacekeeping force for Darfur (UNAMID) continues its deployment. U.N. officials say full deployment

发表于:2019-02-18 / 阅读(59) / 评论(0)

VOA标准英语2008年（三月）

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Arrhenius'doctrine formula

Austral faunal region