21 The following diagram shows thestructure of...... 以下的图展示了...的结构
22 The picture illustrates...... 该图展示了...
23 It mainly consists of followingsteps. 它主要包括以下步骤
24The whole procedure can be dividedinto...stages. 整个的过程可以分为...步
25 The first step is to第一步是...
26 The next step is to接下来的一步是...
27 The last step is to最后的一步是...
28 The first stage involves第一步包括...
29 In the nextstage接着，
30 In the laststage最后，