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记忆技巧：找「更大」→ 弹掉 ≤ 当前的（栈顶保留比当前大的）；找「更小」→ 弹掉 ≥ 当前的；找「相等可接受」→ 用 < / ，否则用 <= / =。，这一点在safew官方版本下载中也有详细论述
在欧洲，17世纪贵族私人游艇已成风尚。美国游艇产业在19世纪中后期已逐步兴起，二战后进入高速成长期，形成集制造、销售、维修、服务于一体的完整工业体系。，更多细节参见夫子
China Deploys Thousands of Fishing Boats off Japan’s Coast, and They Are Not There to Fish