1. The disease follows a natural progression from mild symptoms to severe illness.
这种疾病从轻微症状到严重疾病呈自然顺序发展。

2. The team made great progress in their research, and their findings have led to important advancements in the field.
这个团队在他们的研究中取得了巨大的进展，他们的发现在该领域带来了重要的进步。