Point your phone toward anything that you want to film. You can flip the camera around by tapping the circling arrows in the upper-right side of the screen. Press and hold the video camera circle at the bottom of the screen for as long as you want to film.  Alternatively, tap the button if it has a circle around it. Releasing this option or pressing the stop button will pause your recording, which adds a cut to the final project. Tap the stopwatch icon on the right side of the screen, choose when you want the recording to stop, then tap Start Countdown.  The camera will count down from 3 then start recording until you reach the desired part of the audio. Once it does, you'll be able to film without holding down the video camera circle. You can return to normal filming at any time by tapping the "Stop" icon at the bottom of the screen. You can enhance your video by using the following options:   Beauty effect — Tap the wand-shaped icon to apply the "beauty" effect, which smooths out complexions and brightens the picture.  Color filters — Tap on the filter button on the right recording interface and choose the desired color filter.  You can also swipe between them.  Lenses — Tap the button on the bottom-left corner of the screen, then select a lens to use with a face in the frame. Lenses use facial recognition features to apply a mask or theme to a person's face.  Speed control — Used to control the speed of the video.  You can toggle the controls above the record button on or off, but your last speed setting will be remembered. Your video must be at least 3 seconds long, but it can't be longer than 15 seconds if you have music. As long as you have music selected, your video will automatically cut off at the 15-second mark. If you want to re-shoot the project, you can do so by tapping the X in the upper-left corner of the screen and then tapping Reshoot, or you can delete the current project entirely by tapping X and then tapping Exit in the menu. You can also tap on the delete button in the bottom right corner...

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Write a summary of the previous text in Chinese:
将相机对准拍摄对象。 拍摄片段。 自动拍摄。 添加视频效果。 录制3到15秒的视频。 如果需要重新开始，请删除项目。 继续回到编辑屏幕。