释义：堆放，堆积；积聚；成堆； 英英释义： pile up n.multiple collisions of vehicles同义词：pileupv.collect or gather同义词：accumulatecumulateconglomerategatheramassarrange into piles or stacks同义词：heap upstack upget or gather together同义词：roll upcollectaccumulateamasscompilehoard