Reference for Shabbat 200:3
<big><strong>גמ׳</strong></big> א"ל ההוא מרבנן לרבא בשלמא הילוך הילוך תרי זימני הא קמ"ל הילוך ע"י הדחק שמיה הילוך תשמיש ע"י הדחק לא שמיה תשמיש אלא רקק רקק תרי זימני למה לי חד בימות החמה וחד בימות הגשמים וצריכי דאי תנא חדא ה"א ה"מ בימות החמה דעבידי אינשי דמסגי לאקורי נפשייהו אבל בימות הגשמים לא ואי אשמעינן בימות הגשמים דכיון דמיטנפי לא איכפת להו אבל בימות החמה לא
HE IS LIABLE. <b><i>GEMARA</i></b>. One of the Rabbis said to Raba, As for 'traversing [mentioned] twice, that is well, [as] it informs us this: [i] traversing with difficulty is designated traversing;<span class="x" onmousemove="('comment',' Hence the public road that passes through a pool counts as public ground, though one can only traverse it with difficulty. ');"><sup>5</sup></span> [ii] use with difficulty is not designated use.<span class="x" onmousemove="('comment',' E.g., a pit in the street nine handbreadths deep. Though one can put objects therein, it is inconvenient, and therefore is not the same as a pillar of that height in the street upon which people temporarily place their burdens whilst pausing to rest, and which ranks as public ground (supra 8a). The deduction that such use is not designated use follows from the repetition of traversing, which intimates that only traversing with difficulty is regarded as such, but nothing else. ');"><sup>6</sup></span>