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The responsibility chain pattern describes how requests are passed along a chain of objects. It forms objects into a chain, and the sender sends the request to the first receiver of the chain and passes it along the chain until there is an object to process it or until there is no object to process and it remains at the end of the chain.An event can have many listeners attached to it. These listeners tell the system to call my XXX method when the event occurs by registering their own event handling routines.Humans make planes, which enable them to fly above the clouds. Then, humans use planes to drop bombs on each other.人类在各个领域的进步过程，塑造出成就非凡的工业化时代，而且多半为大家所乐见。然而，我们在课堂上学到的这两百年历史却充满了偏颇思维，现在应该去思考进步背后的历史，并了解我们所认为的进步过程。"Do you remember what type of explosive cylinder your company commander used at that time?" I asked.一帮人跩的跟什么似的，眼下还要往清南村跑，还自以为好聪明哩，一副不肯吃亏的样子。