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backdoor

美音:[´bæk´dɔ: ]点这儿播放单词美音发声
英音:[´bæk´dɔ: ]点这儿播放单词英音发声
adj.秘密的

难易程度:

backdoor为短语/超纲词汇

backdoor


adj [only before noun]
secret, or not publicly stated as your intention
 a backdoor tax rise