It is important to note that certification is not required to be a mystery shopper.
值得注意的是该认证并非必须是一个谜购物。
It should be noted that a balance is not always required in a wind tunnel.
应该指出，天平对风洞来说并非是绝对必须的。
The system could not be unlocked. It is required that you use a smart card.
系统无法解除锁定。您必须使用智能卡。
It is required that the instrument should be tested before it is actually used.
这个工具被要求在正式投入使用之前必须要进行测试。
It is required that the instrument should be tested before it is actually used.
这个工具被要求在正式投入使用之前必须要进行测试。
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