初二的早晨，我按照约定时间来到上车点。远远就看见一辆白色轿车停在路边，一位中年女士从驾驶座下来，笑着朝我招手：“过年好呀！”她一边热情地与我寒暄，一边主动打开后备箱，帮我把年货往里放。“这车主真周到，顺风车果然没选错。”我心里暗暗庆幸。
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Dithering in its simplest form can be understood by observing what happens when we quantise an image with and without modifying the source by random perturbation. In the examples below, a gradient of 256 grey levels is quantised to just black and white. Note how the dithered gradient is able to simulate a smooth transition from start to end.，这一点在旺商聊官方下载中也有详细论述
async pull(controller: ReadableByteStreamController) {