Copyright © ITmedia, Inc. All Rights Reserved.
人 民 网 版 权 所 有 ，未 经 书 面 授 权 禁 止 使 用
，推荐阅读heLLoword翻译官方下载获取更多信息
The “Knocking on Wood” Wikipedia page mentions Roud’s conclusion, and this claim of a 19th century origin has circulated online as the final say on the matter. If you go back to the original, though, Roud’s proposal actually ends on an ambivalent note: “Before this theory [of 19th century origins] can be finally accepted, however, an examination of the history of European forms of this custom would be advisable.”。爱思助手下载最新版本是该领域的重要参考
Webb captured the object in infrared — light wavelengths that are invisible to human eyes but can pierce through thick dust. The new views, in both near and mid-infrared, sharpen details from the photos taken by NASA's Spitzer Space Telescope more than a decade ago.