2013年8月23日
Drainage Ditches
摘要： DescriptionEvery time it rains on Farmer John's fields, a pond forms over Bessie's favorite clover patch. This means that the clover is covered by water for awhile and takes quite a long time to regrow. Thus, Farmer John has built a set of drainage ditches so that Bessie's clover patch i 阅读全文
posted @ 2013-08-23 09:34 persistent codeants 阅读(202) 评论(0) 推荐(0)