它必须看起来像是人工请求，否则Google Books将会停止响应。
It had to look like a human user or Google Books would stop responding.
如果你是要设计一个针对孩子的网站，比如——它必须看起来跟最终用户是注册会计师的网站非常的不同！
If you were designing a site for kids, for instance - it would need to look very much different from a site where the end users are to be chartered accountants!
因此，它必须在视觉上引人注目，而且最好看起来像一个按钮。
Hence, it should be visually apparent and it is preferable for it to look like a button in appearance.
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