illegal type of expression [计] 非法表达式类型
illegal expression
非法表达式
以上为机器翻译结果，长、整句建议使用 人工翻译 。
What Attwell has done is relatively simple: he saw an expression of demand for books in the illegal copying and found a way to facilitate that demand legally.
FORBES: The Future For Bookshops Is To Pave The Cowpaths
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