Explanation: This does not refer to the Aron that Betzalel made. Presumably, they would not mention the Aron that was hidden many years ago in Bayis Rishon! Rather, it refers to the Aron in the Beis ha'Keneses.

Implied question: Everywhere it is called "Teivah", like the Mishnah (Brachos 34a) teaches "one who descends in front of the Teivah"!

Answer (Ri): We find that it is called also "Aron", like it says "nine [men] and the Aron join [to make a Minyan - Brachos 47b].

Question (Ri): in Kidushin (34a), it says that every Mitzvas Aseh [she'Lo ha'Zman Gerama, i.e. it applies at all times, women are obligated];

It asks that we should equate Mezuzah to Talmud Torah. I.e. women should be exempt from Mezuzah, just like they are exempt from Talmud Torah;

Citation (34a): You cannot say so. It says "Lema'an Yirbu Yemeichem" - do men need [long] life, but women do not need life?!

Summation of question: This ("Lema'an Yirbu Yemeichem") applies also to Talmud Torah, like it connotes here, even though women are exempt!

Answer: We would obligate women in Talmud Torah due to this reason (also they need life), had the Torah not explicitly excluded them "v'Limadtem Osam Es Beneichem", and not your daughters;

However, regarding Mezuzah there is no exclusion, only a Hekesh. For this reason (also women need life), we should say that we do not equate [to Talmud Torah to exempt them].

Implied question: Why don't we answer here that [Rebbi] means even for the Aveirah of Bitul Torah, like we answer below (33b) regarding "even for Leshon ha'Ra"?

Answer: There, it is appropriate to say that [R. Elazar b'Rebbi Yosi] means even, for in the second Beraisa that [the Gemara] brings after it, he refers also to [the words of] the first Tana, who said "for Leshon ha'Ra", and [R. Elazar] said "even for eating matters that were not tithed";

However, here, if he means "even", the Beraisa above, in which he does not refer to the first Tana, he should have said "even for the Aveirah of Bitul Torah"!

Explanation: Only in their days, when their garments had four corners, one who did not have Tzitzis was punished, like is proven regarding the angel who rebuked Rav Katina (Menachos 41a. In summer he wore a linen garment, which Chachamim decreed to exempt it, and in winter he wore a garment with only two rectangular corners);

However, nowadays people do not wear such garments. One need not buy [a four cornered garment], but it is good to buy a Talis and bless on it every day, like it says in Sotah (14a) "did Moshe want to enter [Eretz Yisrael] to eat its fruits?!"

Rather, Moshe said "a Mitzvah that I can fulfill, will be fulfilled through me."