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if not condition(self._value):。业内人士推荐同城约会作为进阶阅读
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Those companies knew they had a captive audience, so they bought up as many journals as they could. Journal articles aren’t interchangeable commodities like corn or soybeans—if your science supplier starts gouging you, you can’t just switch to a new one. Adding to this lock-in effect, publishing in “high-impact” journals became the key to success in science, which meant if you wanted to move up, your university had to pay up. So, even as the internet made it much cheaper to produce a journal, publishers made it much more expensive to subscribe to one.
单是老龄化带来的市场，就已十分巨大。针对助老场景，不能纯用消费电子的逻辑，专业的服务能力也很必要。就像“卖耳机，还是卖助听器”，逻辑完全不同。