杂草生态学

VOA慢速英语2013 Agriculture Report - Getting a Firm Grip on Weed Control

Agriculture Report - Getting a Firm Grip on Weed Control 农业报道 - 控制杂草生长的办法 This is the VOA Special English Agriculture Report. 这里是美国之音慢速英语农业报道。 When is a plant considered a weed? Experts at Pen

发表于:2018-12-07 / 阅读(129) / 评论(0)

2013年VOA慢速英语(一)月

Agroecology, Part 2

By Mario Ritter Broadcast: October 7, 2003 This is Doug Johnson with the VOA Special English Agriculture Report. Today we finish a two-part series. A listener in Brazil asked about 1)agroecology. This

发表于:2019-01-02 / 阅读(95) / 评论(0)

VOA2003（下）-农业与经济

Agroecology, Part 1

By Mario Ritter Broadcast: September 30, 2003 This is Steve Ember with the VOA Special English Agriculture Report. This week, we take a suggestion from a listener in Brazil. Agricultural specialist Lu

发表于:2019-01-04 / 阅读(77) / 评论(0)

VOA2003（下）-农业与经济

VOA慢速英语2013 Getting a Firm Grip on Weed Control

Getting a Firm Grip on Weed Control This is the VOA Special English Agriculture Report. When is a plant considered a weed? Experts at Penn State University have a simple answer: When the undesirable qualities outweigh the good qualities. Consider the

发表于:2019-01-12 / 阅读(69) / 评论(0)

2013年VOA慢速英语(五)月

VOA慢速英语2011--Inventor of Weed Eater Started a Revolut

Agriculture Report - Inventor of Weed Eater Started a Revolution 农业报道 - 巴拉斯开启割草机革命 This is the VOA Special English Agriculture Report. 这里是美国之音慢速英语农业报道。 George Ballas of Houston, Texas, lived

发表于:2019-01-12 / 阅读(62) / 评论(0)

2011年VOA慢速英语(七)月

美国国家公共电台 NPR Damage From Wayward Weedkiller Keeps Growing

RACHEL MARTIN, HOST: Farmers in parts of the South are fighting each other over a weed-killing chemical. Some are using it in combination with a new generation of genetically engineered crops. Others are angry because it's blowing in the wind and dam

发表于:2019-01-16 / 阅读(50) / 评论(0)

2017年NPR美国国家公共电台7月

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