单词：treadlemill
脚踏传动式磨; 脚踏传动式试验台
单词：treadlemill 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(111) / 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(119) / 评论(0)
农业与发展
农业与发展