侍者有回到厨房帮你拿特定的无糖甜品，或者愉快地改正厨师犯的差错？
Did they run back to the kitchen to get that special sugar-free sweetener for you, or happily fix an order the chef flubbed?
添加剂模型帮助用工具工作，建立者对时间期限犯和费用而且借此避免不愉快的惊奇和客户冲突。
Additive models help tool builders commit to timelines and costs and thereby avoid unpleasant surprises and client conflicts.
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