纽约市教学研究员(NYC Teaching Fellows)等项目通过简化资格认证流程，降低了准入门槛，但是它们仅是为数不多的特例。
Programs like NYC Teaching Fellows may reduce the barriers to entry by streamlining the certification process, but they're the exception.
原料的采购，供应商的采购流程，包括供应商的选择，供应商的资格认证情况，长期供应合约签订的商谈，质量的监控和储运时间的控制。
Purchase materials and supplies, procurement activities, including vendor selection, qualification, negotiating long-term supply contracts, and monitoring quality and timeliness of delivery.
原料的采购，供应商的采购流程，包括供应商的选择，供应商的资格认证情况，长期供应合约签订的商谈，质量的监控和储运时间的控制。
Purchase materials and supplies, procurement activities, including vendor selection, qualification, negotiating long-term supply contracts, and monitoring quality and timeliness of delivery.
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