名詞 pile up:

1. multiple collisions of vehicles
   同義詞：pileup

動詞 pile up:

1. collect or gather
   同義詞：accumulate, cumulate, conglomerate, gather, amass
2. arrange into piles or stacks
   同義詞：heap up, stack up
3. get or gather together
   同義詞：roll up, collect, accumulate, amass, compile, hoard

1. Cars often pile up here in the rush hours.
   在交通擁擠時(shí)刻汽車往往在這里擠成一團(tuán)。
2. Instead of waiting until problems pile up, we should try to solve each as it arises.
   問題一出現(xiàn)就應(yīng)設(shè)法解決，不要等問題成了堆再去解決。
3. Oh, wow. There's a lot of work piled up.
   哎呀，工作堆積得不少。
4. Strains in the earth's crest seem to pile up, mail the rock formations break with cracks into new positions, often causing large natural earthquakes.
   地殼的應(yīng)力似乎在積累著。直到巖層產(chǎn)生裂縫移位為止，這往往全引起大的自然地震。