The small churchyard was surrounded by a rusted wrought-iron fence.不大的教堂墓地周边围着一圈生锈的熟铁栅栏。The wheel had long since rusted from years of disuse.多年不用的车轮早已锈迹斑斑。I can't get these screws out; they've rusted in.我无法取出这些...
These techniques include the ionospheric tomography, airglow, GPS beacon, conjugate observations and radar interferometry.这些方法包括断层扫描技术 、 大气晖光之影像 、 全电子密度之变化 、 共轭点之效应及雷达散射.Based on these projections, the Tomography algorit...