The principal advantage of the photoelastic strain gauge is that it is directed reading self-contained.
计的主要优点在于它是直读而整装的。
Take what you've learned in school and build on that base with private instruction and directed reading on the relevant subject.
在运用学校知识的基础之上，形成自己的思路，直接引用相关的论点。
Paterson more than made up for the lack of schooling with self-directed education, voraciously reading the classics of poetry and literature.
帕特森如饥似渴的阅读诗歌和文学经典，凭借自我导向的教育不仅弥补，而且还胜过了学校教育。
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