单词：treadle bar
压条,接触条;轨道接触器
单词：treadle bar 相关文章
This is the VOA Special English Development Report. A simple water pump is helping to improve the lives of poor families in several Asian and African countries. A treadle pump in vegetable fields in Bangladesh The treadle pump is based on a design d
发表于:2019-01-11 / 阅读(35) / 评论(0)
VOA慢速英语2009年（八）月
VOA慢速英语2009年（八）月
AGRICULTURE REPORT - Simple Ways to Protect Water Quality By Mario Ritter Broadcast: Tuesday, July 26, 2005 I'm Barbara Klein with the VOA Special English Agriculture Report. Afghans wash carrots in d
发表于:2019-01-30 / 阅读(67) / 评论(0)
农业与发展
农业与发展