然而，有时物种入侵并非偶然。
有时他会装作偶然地移开头，那读者便会抓紧时间在他的头移回来之前读上一到两个词。
Every now and then he withdraws his head as if by chance. The reader will anxiously devour one or two words before Luke moves back into position.
这种简单的反应有时创造出令人费解的斑纹，而这可能只是出于偶然。
That simple reactions of this sort sometimes result in cryptic patterns could be a coincidence.
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