A float collar is placed at the top of the float joint and a float shoe placed at the bottom to prevent reverse flow of cement back into the casing after placement.
浮箍是放置于浮动接头之上的，而浮鞋则是放置于浮动接头之下，以防止水泥浆回流到套管内。
3
So he turned up his collar and shuffled across the top of the dam (luckily it wasn't so slippery since the snow had fallen) to the far side of the river.