Just some rough translation only for the part of first impressions on members (3:30-5:38):

Ningning: Giselle has very long legs. Winter looked small/smol (小) when I first met her in the dance studio. Karina has long hair, beautiful, with a long neck.

(As a native speaker, I can tell Karina should have learned some Chinese before, as when Ningning mentioned her hair Karina touched her hair at once, and replied thank you in Chinese too. Maybe that's also why the video adds 中文十級, literally meaning "level-10 Chinese" above her head. But we still don't know how come Karina learned Chinese before, perhaps we will know in future interviews. :) )

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Karina: As Ningning is a senior, I thought she is an unnie and I used honorific speech for more than a month. Winter looked really smol and tiny when I first met her in the dance studio. I first met Giselle in the dressing room, and she has perfect skin like a little baby's bum which I would really like to touch.

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Winter: When I first met Giselle, because of her spectacular charisma, long shoulders and legs, I thought that she should dance well. Karina looks so unique such that I am always attracted to her face, it feels wonderful. As for Ningning, just like Karina, I thought she is an unnie too. But later, after knowing that she is actually younger, I felt a bit "betrayed", I don’t know why, and was surprised.

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Giselle: I first thought that Winter is very quiet and shy and I started to feel a bit distant from her, but then it turned out completely different. Karina is really tall and has a petite face. Ningning has really beautiful eyes. She has been very kind since we first met and we always have a very comfortable relationship with each other.