// 注意：slice(0, 负数)会返回空字符串，需兼容（比如stack长度<k时，slice后为空）
The choanoflagellate Choanoeca flexa forms motile and contractile cell monolayers purely clonally, purely aggregatively or through a combination of both processes depending on environmental conditions.
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How to try Nano Banana 2Google says that Nano Banana 2 is rolling out as Gemini 3.1 Flash Image immediately. Free users will have limited generations, with paid and enterprise users getting wider access. It's available in the Gemini app as well as other Google products, including: