基本解释中间膨大的小圆柱同根派生 英汉例句Semi-recessed wheels are integrated in the back for easy transport and do not take up extra space when the Ballister is loaded in a truck. 装在音箱背后的内嵌式脚轮，方便运输，当把音箱搬上车时，轮子可以藏在凹槽里，节省空间。