一旦它在那里，他们很难保持他们在商店里，因为他们实在没有一个线索，将如何做，他们甚至很难相信他们的市场研究数据。

Once it was out there, they had a hard time keeping them in stores since they really didn't have a clue how well it would do and they had a hard time even believing their market research figures.

youdao

如果浏览器不能播放任何格式，将提供一个没有文件被载入的视觉线索。

If the browser can't handle any of the formats, it will provide a visual clue that no file is loaded.

youdao

没有线索可以找到这样的一个人。

No trace of such a person can be found.

youdao