“各方面的知识”可以翻译为“knowledge in various aspects” 或者 “knowledge from all fields/areas” 。
例句：
We should acquire knowledge in various aspects to broaden our horizons.
我们应该获取各方面的知识来拓宽视野。
He has a deep understanding of knowledge from all fields.
他对各方面的知识都有深刻的理解。