Question

Scientists think they have broken through in their attempt to find the causes of many major disease

请大家帮我分析？ 谢谢！
翻译：科学家们认为, 他们在探索主要病症的病因方面有了新的进展。 我是想要详细的语法分析 谢谢

Answer 1

科学家们认为，他们已经在试图寻找许多主要疾病的原因上，取得了突破。

Answer 2

主句主语scientists,谓语 think ，宾语 they have broken through in their attempt to find the causes of many major disease，这是一句宾语从句，think后面可以加that 可以不加。
然后分析从句：从句主语they，谓语have broken through in，their attempt 是宾语，to find the causes of many major disease是attempt的后置定语。

Answer 3

科学家认为他们已经打破找到许多重大疾病的原因。
希望可以帮到你, 谢谢。