如果不指定bshdev2，每个作业会在第一个可用的队列设备上执行，这会导致同时(不连续)运行多个作业。
Without specifying bshdev2, each job would be executed on the first available queue device, which would result in multiple jobs running simultaneously (non-sequentially).
工作顺序是不固定的，它有可能是不连续的。
The sequence of work is, not fixed and can be subject to discontinuity.
图像的边缘表现为图像上的不连续性，边缘检测就是检测图像上的不连续点或陡变点。
The edge of image is manifested as discontinuity in image, what edge detection means is to doled (in the image ) those discontinuous points or sharp variation points.
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