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。
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