The mowerfirmly refused to mow, so I decided to dismantle it. The garden was soon littered withchunks of metal which had once made up a lawn mower. But I was extremely pleasedwith myself.

　　19.The mower firmly refused to mow, so I decided to dismantle it.

　　修完后割草机还是纹丝不动。于是，我决定把它拆开。

　　20.The garden was soon littered with chunks of metal which had once made up a lawnmower.

　　一会儿工夫，割草机便被拆成一个个金属零件，乱七八糟地堆在花园里。

　　21.But I was extremely pleased with myself.

　　但我却非常高兴，因为我找到了毛病所在。