1、蜗牛英语：snail，英[sneɪl]美[sneɪl]。2、蜗牛壳呈螺旋形。Asnailsshellisspiralinform.3、火车这会儿走得跟蜗牛一样慢。Thetrainwasmovingnowatasnailspace.4、这些蜗牛体宽不超过1厘米。Thesnailsarenolargerthanonecentimetreacross.