| 詞性詞形譜(n)underground(n)grounding grounds groundage grounder groundlessness groundling ground(v)ground(a)underground ≠ overground grounded groundless(ad)underground groundedly groundlessly underground 義務(wù)階段1500 全國卷頻次：22 /??nd?ɡra?nd/ US /??nd?rɡra?nd/ a.&n. 地下的 & Am subway 地鐵 高考真題原句提選：It come from underground.它來自地下。It is very convenient to travel in London by Underground.在倫敦乘坐地鐵非常方便。 |