2.2.1 混乱脚本示例（bad_spider.py）
"We saw the news that this rocket had crashed into Poland. It had flown almost directly over us, and we thought, 'oh, this is a great chance'", explained Prof Robin Wing at the Leibniz Institute of Atmospheric Physics in Germany.
。同城约会是该领域的重要参考
多家供应链与渠道人士确认，智能手机存储芯片采购成本较去年同期已上涨超过 80%，且涨势仍未见放缓迹象。
// Async — when source or transforms may be asynchronous