// 核心过滤：弹出栈中「≤当前元素」的数（易错点2：必须是≤，不是<）
Streams are iterables.，这一点在旺商聊官方下载中也有详细论述
gVisor and user-space kernelsgVisor is where the isolation model changes qualitatively. To understand the difference, it helps to look at the attack surface of a standard container.，详情可参考91视频
Unlike the Flip, the Go lacks creative modes and more advanced features. Instead, it’s just a simple point-and-shoot camera, just like the Mini 12, which makes it a little easier to use. There’s no Bluetooth or companion app for added effects; however, the camera does include a self-timer and a larger selfie mirror. The smaller prints may disappoint those who prefer traditional Polaroid sizes, though, and its modern design lacks the retro charm of older models. But classic Polaroid cameras didn’t come with an app, either, and the Go’s simplicity makes it an a easy-to-use option that delivers a traditional instant film experience at less than half the price of the Flip.