ADJECTIVE | VERB + BLOCKAGE | PREPOSITIONADJECTIVE➤complete徹底堵塞▸➤partial部份堵塞VERB + BLOCKAGE➤cause, create引起/造成堵塞▸➤prevent防止堵塞▸➤clear, remove清除堵塞物◇They used chemicals to clear the blockage.他們使用化學製品清除了堵塞物。PREPOSITION➤blockage in⋯的堵塞◇a blockage in a major artery主動脈堵塞
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