adjective · having an empty space or cavity inside

这种建筑使用的是轻质的空心砖。

adjective · (of vegetables) to become hollow or pithy inside, often due to being overripe or old

萝卜放的时间太长，已经变空心了。

adjective · (of a basketball shot) passing through the hoop without touching the rim

他的三分球空心入网，全场一片欢呼。

adjective · on an empty stomach

医生嘱咐这种药要空心服用。