刚开始的时候，当代首饰是一个不为人知晓的领域，所以他们需拥有传教士般的热忱向他们的顾客讲解相关的知识。
When they started, contemporary jewellery was an unknown field and they had a missionary zeal to educate their clients.
被评估的机构一般不知晓神秘顾客的特定身份和目的。
The mystery consumer's specific identity and purpose is generally not known by the establishment being evaluated.
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