最后是体积与重量。心脏被紧紧包裹在局促的胸腔内，泵体越大、越重，不仅手术创伤大，还会对患者原生心肌造成长期的重力拉扯。对于体型较小的女性和儿童，庞大的设备甚至根本无法植入。
if there’s one thing i hope you take away from this, it’s that intersection and complement are genuinely useful operators that have been missing from regex engines for far too long. being able to describe what you want as a combination of properties, rather than cramming everything into one monolithic pattern, is a much more natural way to think about matching. and now you can do it with linear-time guarantees.
，这一点在safew官方下载中也有详细论述
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