The strong wind shook the (thick) birch tree.
Note: When you start writing, you should add effective ingredients reasonably according to the needs of expression. Don't stack words with the same meaning stiffly, repeat them before and after, and don't change the meaning of the original sentence. Text expansion method:
1. Read the sentence or text carefully and determine the center. Find the key points around the center and prioritize the expansion. Don't hesitate to write the key points and touch the second ones. Such articles will give people the impression of outstanding center and reasonable structure.
2. When expanding, the supplementary content should be consistent with the original content, and the connection should be natural and smooth.
3. Think boldly, be different, and strive to create a new environment and create a new image.
4. To keep the essence of the sentence, we should not blindly expand and change the original meaning of the sentence.