.However，the criminals quickly came to realize that the real value in the computers is in the chip which is remarkably portable and unidentifiable，so even when caught the police have trouble proving the theft.

　　結構分析:句子的框架是the fraternity…came to realize that…so…the police have trouble…。這是一個并列復合句，兩個句子由so連接。在前面句子里that引導賓語從句，做realize的賓語;此從句中又有which引導的定語從句修飾the chip; so后面句子里when caught是過去分詞做狀語，when caught即when the thief was caught; proving是現(xiàn)在分詞，修飾trouble。

　　譯文: 但偷盜者認識到，電腦中真正值錢的東西是芯片(或叫集成電路片)，這是可以隨身攜帶和無法識別的。即使當場被抓住，警察也難以證明那是偷來的。