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The process chart illustrates in … steps (the process of)名词 …/ how句子…/ the development of 名词…
流程图：process chart, sequence chart, progress chart, diagram
说 明：illustrates/ shows/ depicts/ demonstrates/ explains/ describes
步 骤：steps/ stages
位于：stand, lie, be located, be situated, can be seen, can be spotted, scatter, perch…
起初：Initially, At the beginning, At first,
发生：take place, happen, occur, break out
In the following 50 years, the forest took place great changes.
出现：appear, come into being, emerge, turn up, occur
A large number of small trees came into being in the forest.
消失：disappear, can no longer be seen, be destroyed, be removed, be wiped out, vanish
All the great trees were wiped out/burnt down/destroyed in the fire.
取代：A replace B; A take the place of B; A appear instead of B; A come into being in place of B;
A great number of small trees came into being instead of the big trees wiped out by the fire.
变成：become 名词/形容词；turn, develop, grow, change 形容词/into 名词；
扩大（面积）：expand, stretch, spread
缩小（面积）：shrink, wither, withdraw
The progress chart illustrates in 5 steps the development of the forest in Yellowstone National Park after a fire disaster.
Initially, big trees stood at a low density in the old forest. There were some bad woods scattering on the soil. It might have been the cause of the fire later.
Then, the fire broke out and destroyed everything, the trees and the bad woods. In the 50 years after this, the forest had its first major development. A great number of small trees replaced the big trees which had been wiped out by the disaster.
The following five decades witnessed a new development of the forest. The trees turned larger and the number of them shrank obviously. It might have been the result of life competition and natural selection.
This development went on throughout the following two centuries. The trees grew even larger and the density withered further.
In the end, 300 years after the disaster, the forest recovered completely. The trees resumed their size and density before the fire.