革玛拉 答:这一句是依 拉比泽拉 的意思,因为 拉比泽拉 说:横梁在巷内、它弯的那一段却在巷外;或者它在离地二十肘之内、弯的那一段却过了二十肘;或者它在十掌以上、弯的那一段却在十掌以下——就是说梁弯的那一段落在横梁不管用的范围之外——人就这样看:凡把那落在管用范围之外的弯段除去之后,横梁这一段管用的与那一段管用的之间空着不足三掌的,就不必再拿一根横梁来。
The Gemara answers that this is in accordance with the opinion of Rabbi Zeira, as Rabbi Zeira said: If the cross beam is inside the alleyway, and its curved section is outside the alleyway; or it is within twenty cubits of the ground, and its curved section is above twenty cubits; or it is above ten handbreadths, and its curved section is below ten handbreadths, meaning that the curved part of the beam is outside the area where a cross beam is effective, one considers the situation: In any case where, were the curved section outside the area where a cross beam is effective removed, there would not be a gap of three handbreadths between this effective part of the cross beam and that effective part of the cross beam, one need not bring another cross beam.