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优化器可以利用其有关设备组件的知识，确定复杂联接操作中的最佳联接顺序。
The optimizer can use its knowledge of the appliance components to determine the best join order in a complex join.
即使是授权用户也需要有专业知识才能操作它们。
Even authorised users require specialist knowledge to operate them.
煤油安全知识的掌握与安全操作呈正相关。
Knowledge of paraffin safety and safe practices were positively correlated with each other.
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