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。
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Procurement is at the heart of enterprise spending, where companies look to buy everything from raw materials to professional services. Each purchase order requires focus and commitment: One usually has to open some type of Enterprise Resource Planning (ERP) software, check contract management systems, search the supplier database, run compliance checks, cross-reference budgets, dig through emails, and so on.，推荐阅读同城约会获取更多信息