Hence, Bu must adjoin to ahead.
因此否定标记“不”必须嫁接到一个中心词上。
参考来源 - 汉语否定标记“不”的语义和句法·2,447,543篇论文数据，部分数据来源于NoteExpress
V-T If one room, place, or object adjoins another, they are next to each other. 紧邻 [正式]
The doctor's bedroom adjoined his wife's and the door between the rooms was always open.
这位医生的卧室紧邻他妻子的卧室，两间房之间的门总是开着的。
The doctor's bedroom adjoined his wife's and the door between the rooms was always open.
这位医生的卧室紧邻他妻子的卧室，两间房之间的门总是开着的。
Historians have noted that at one time fruits, imported from Spain, used to be unloaded at a wharf on the Thames that once adjoined the old churchyard.
历史学家说，有一段时间，从西班牙进口的水果曾在泰晤士河的一个码头卸货。这个码头曾经与该教堂的旧址毗邻。
Meanwhile, I was still sleeping on a couch, this one in the small living room that adjoined our bedroom. I slept on that old couch for two months or more.
在这期间，我仍旧睡在一个沙发上，一睡就是两个多月，它放在靠近我俩卧室的小起居室里。
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