Some of the tenth-century stave churches of Norway are still standing, demonstrating that with sound design and maintenance, wooden buildings can last indefinitely.

　　= Some of the tenth-century stave churches of Norway/ are still standing/, demonstrating/ that with sound design and maintenance/, wooden buildings can last indefinitely.

　　#一些10世纪的木制教堂挪威的/仍然耸立着/，证明/有坚固的设计和保护/，木制的建筑物能无限期的保持下去。

　　*句子虽然很短，但是几乎每个词都需要考虑。意思比较简单，容易理解。

　　In the United States, trade unions encountered far more intense opposition in their struggle for social legitimacy than did the organized labor movements of most other democratic nations.

　　= In the United States/, trade unions/ encountered far more intense opposition/ in their struggle for social legitimacy/ than did the organized labor movements of most other democratic nations.

　　#在美国，贸易组织/实施强烈反对多得多/在他们对社会合法性的斗争中/比有组织的劳工运动绝大多数民主国家的。

　　*这个句子很短，大意比较容易掌握，注意有些词的意思要仔细琢磨。