Transforms can be stateless or stateful. A stateless transform is just a function that takes chunks and returns transformed chunks:
查看控制台: http://127.0.0.1:18789/
，详情可参考夫子
if not item.get("title"):
Adam Levy investigates why researchers are sometimes reluctant to disclose their plans to colleagues.
（一）盗窃、损毁、擅自移动铁路、城市轨道交通设施、设备、机车车辆配件或者安全标志的；