The spray, based on a natural brain chemical, could be effective within two hours, compared to several days for some of the most widely used antidepressant drugs.

该喷剂以天然大脑化学物质为基础，两小时内就可见效，而通常使用的抗抑郁药要几天才见效。

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Usually I got very useful replies within minutes, with more still coming for up to several hours later.

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"This entry into Mexico occurred within several hours of Summers being identified in the media as the person responsible for the kidnapping, " a federal complaint stated.

NPR: Suspect In LA Girl's Abduction Captured In Mexico