The different color uniforms represent different ranks of flight attendants.
不同的制服颜色代表乘务员的不同级别。
Different services use different words to show their ranks.
不同的军种用不同的词示明他们的军衔。
Objective To study the influence of different coal ranks on the prevalence of pneumoconiosis.
目的探讨不同煤质煤尘对尘肺患病的影响。
Objective To study the influence of different coal ranks on the prevalence of pneumoconiosis.
目的探讨不同煤质煤尘对尘肺患病的影响。
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