延迟固井技术主要用在小间隙、窄环空井眼和一些特殊井的固井工艺中。
Delayed cementing technology is mainly used for cementing slim holes, Wells with small annular space and some special Wells.
四月，绕土星运行的机器人卡西尼号土星探测器拍了这张横穿太阳系最有名的环的窄角照片。
In April, the robotic Cassini spacecraft now orbiting Saturn took this narrow-angle view looking across the Solar System's most famous rings.
这幅图像是环月轨道探测照相机(LROC)拍摄的，它包括一对窄角照相机和一个广角照相机。
This image was taken by the Lunar Reconnaissance Orbiter camera, or LROC, which consists of a pair of narrow-angle cameras and a single wide-angle camera.
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