“小心空隙”这个短语，最早是在北部线上应用的。
Page推测，这个综合症可能是由于Y染色体重组时出错，导致染色体中不小心出现了一段中心没有空隙的回文。
The syndrome may be the result of Y chromosome recombination gone awry, Page speculates, when the chromosome inadvertently becomes a palindrome with no gap in the center.
往兆康嘅505线列车即将到站，乘客请勿超越黄线，上车时，请小心月台间嘅空隙。
The train on route 505 to Siu Hong is arriving, please wait behind the yellow line and mind the platform gap when boarding.
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