Unconsumed bodies: Pull semantics mean nothing happens until you iterate. No hidden resource retention — if you don't consume a stream, there's no background machinery holding connections open.
在深入探讨之前，我想先退一步回答你的问题。丹·艾瑞里（Dan Ariely）写过一本非常棒的书叫《怪诞行为学》。我以前常把这本书发给公司的所有产品经理，让他们通过学习这本书来搞清楚我们该如何向用户收费。书中有一个很经典的例子：想象一下，半夜12点你被锁在公寓外面，你叫了一名锁匠。他1分钟就赶到了，花了30秒帮你开了门，然后向你收费500美元。你心里肯定会想：“就干了90秒的活，居然收我500美元？搞什么鬼！”于是你会在Yelp上给他留个一星差评，不给小费，甚至可能向信用卡公司申请撤销这笔扣款。，详情可参考新收录的资料
Bell and her partner Steve Powell, from Kent, paid tribute to the "kindness and selflessness" of the donor and her family for their "incredible gift", while also thanking medical teams in Oxford and London who supported their journey.，详情可参考新收录的资料
BeagleBoard BeagleBone Green Eco ($42)，更多细节参见新收录的资料