Dgps
差分GPS系统
🗣️ 情景例句
Dad often works late,
爸爸老是工作到很晚，
A middle course is the safest.
中庸之道最保险。
that a series of deep soundings was obtained in the Atlantic and the first samples were collected by dredging the bottom.
才在大西洋测得一个个海水深度，同时通过挖掘海底，取得了研究海底的首批样品。