“阅读而知”可以翻译为 "gain knowledge through reading" 或 "acquire understanding through reading"。
Gain knowledge through reading 强调通过阅读获取知识。
Acquire understanding through reading 侧重于通过阅读获得理解或领悟。
根据具体语境，也可以使用更简洁的表达，如 "learn by reading"。