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今日长难句：
Experience can rarely, unless guided by a theoretical concept, arrive at results of any great significance...on the other hand, an excessive trust in theoretical conviction would have prevented Marconi from persisting in experiments which were destined to bring about a revolution in the technique of radio-communications.
除非以理论概念为指导，否则经验很少能得出任何具有重大意义的结果……另一方面，过度依赖理论也会阻止马可尼坚持进行那些注定会带来无线电通信技术革命的实验。
第一步 简单划分句子，进行断句
Experience can/ rarely, unless /guided by /a theoretical concept, /arrive at/ results of any great significance/...on the other hand, /an excessive trust /in theoretical conviction /would have prevented Marconi from /persisting in experiments/ which were destined to bring about a revolution /in the technique of radio-communications.
第二步 抓动词 看主语 最后在加入修饰成分和从句进一步理解
Experience can/ rarely, unless /guided by /a theoretical concept, /arrive at/ results of any great significance/...on the other hand, /an excessive trust /in theoretical conviction /would have prevented Marconi from /persisting in experiments/ which were destined to bring about a revolution /in the technique of radio-communications.
主语都是experience经验 can rarely arrive at... unless guided by
an excessive trust in...过度的相信would have prevented...from...可能会阻止...
which修饰的是experiments定语从句 were destined to bring out a revolution..
“注定带来变革的那些实验”
第三步整体看一下
on the other hand 意思是另一方面
of great significance= greatly significant=very important
Experience can rarely, unless guided by a theoretical concept, arrive at results of any great significance...on the other hand, an excessive trust in theoretical conviction would have prevented Marconi from persisting in experiments which were destined to bring about a revolution in the technique of radio-communications.
除非以理论概念为指导，否则经验很少能得出任何具有重大意义的结果……另一方面，过度依赖理论也会阻止马可尼坚持进行那些注定会带来无线电通信技术革命的实验。
核心要点：
1. prevent from
The government tries to prevent the disease from spreading by giving away free masks.
2. guide
Guided by the stars, he finally manages to get out of the desert.
3. rare
It is a rare case. I have never heard of anything like this.
4. bring about
The 5G technology is sure to bring about a new wave of revolution and trend.
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