亲爱的小朋友,您知道吗?在海潮的海水中有着奔腾的河流、美丽的雪山和雄伟的瀑布。这一切构成了神奇的海中景象。奔腾的河流海洋中的河流称作“海流”。它与陆地上的河流一样,日夜不停地沿着固定的路线流动, 而且有一定的长度、宽度、深度和速度。海流的 Dear children, do you know that there are Pentium rivers, beautiful snow-capped mountains and majestic waterfalls in the sea? All this constitutes a magical sea scene. Rivers in Pentium are called “currents”. Like rivers on land, it flows along fixed routes day and night with a certain length, width, depth and speed. Current