Taking jack as an example, the selective principia of software tool and lectotype project was analyzed, the facture process of simulating water flow and enlarging sample for spring was presented.
并以千斤顶为例，分析了工具软件和选型方案的选择原则，给出了放样弹簧、模拟水流等的制作过程。
2
It was a fine day in spring. Jack went to the beautiful garden with his parents. The family were working in the garden. They were planting some flowers there.