Mishnayos Eruvin Perek 7 Mishnah 4
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עירובין פרק ז׳ משנה ד׳
If one placed a board four handbreadths wide across the ditch so that he could cross it, and similarly, if two balconies [gezuztraot] in two different courtyards are opposite one another, and one placed a board four handbreadths wide between them, the residents of the courtyards or balconies establish two eiruvin, and if they desire, they may establish one, as the board serves as an opening and a passageway between them. If the width of the plank is less than four handbreadths, the residents establish two eiruvin, but they may not establish one eiruv.
נָתַן עָלָיו נֶסֶר שֶׁהוּא רָחָב אַרְבָּעָה טְפָחִים, וְכֵן שְׁתֵּי גְזֻזְטְרָאוֹת זוֹ כְנֶגֶד זוֹ, מְעָרְבִין שְׁנַיִם, וְאִם רָצוּ, מְעָרְבִין אֶחָד. פָּחוֹת מִכָּאן, מְעָרְבִין שְׁנַיִם וְאֵין מְעָרְבִין אֶחָד:
Bartenura
נתן עליו נסר. משפתו לשפתו כעין גשר, הוי כמו פתח:
שתי גזוזטראות. כמין תקרה בולטת מרה״י על רה״ר, ונתן נסר רחב ד׳ מזו לזו, הוי נמי פתח:
פחות מכאן. שאין הנסר רחב ד׳, אדם ירא לעבור עליו ולא ניחא תשמישתיה:
נתן עליו נסר – from one rim/border [of the trench] to the other, like a kind of bridge, which is like an opening.
שתי גזוזטראות – as a kind of protruding ceiling/roofing from the private domain on the public domain, and he places a plank that is four [handbreadths] wide from one side to the other, and it is also an opening.
פחות מכאן – that if the plank is not four [handbreadths] wide, a person will fear to pass upon it and its use won’t be pleasant [and hence requiring two Eruvin – one for each side].